feat(ctb): Support variable length traces in `FaultDisputeGame` (#6316)

* init: Variable trace length support

* Support variable trace lengths

* chore: gas-snapshot

* chore: bindings

* chore: lint

* chore: Bump Semver + :broom:

* chore: resolve conflicts

op-bindings/bindings/faultdisputegame.go

@@ -31,7 +31,7 @@ var (
 // FaultDisputeGameMetaData contains all meta data concerning the FaultDisputeGame contract.
 var FaultDisputeGameMetaData = &bind.MetaData{
 	ABI: "[{\"inputs\":[{\"internalType\":\"Claim\",\"name\":\"_absolutePrestate\",\"type\":\"bytes32\"},{\"internalType\":\"uint256\",\"name\":\"_maxGameDepth\",\"type\":\"uint256\"},{\"internalType\":\"contractIBigStepper\",\"name\":\"_vm\",\"type\":\"address\"}],\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"inputs\":[],\"name\":\"CannotDefendRootClaim\",\"type\":\"error\"},{\"inputs\":[],\"name\":\"ClaimAlreadyExists\",\"type\":\"error\"},{\"inputs\":[],\"name\":\"ClockNotExpired\",\"type\":\"error\"},{\"inputs\":[],\"name\":\"ClockTimeExceeded\",\"type\":\"error\"},{\"inputs\":[],\"name\":\"GameDepthExceeded\",\"type\":\"error\"},{\"inputs\":[],\"name\":\"GameNotInProgress\",\"type\":\"error\"},{\"inputs\":[],\"name\":\"InvalidParent\",\"type\":\"error\"},{\"inputs\":[],\"name\":\"InvalidPrestate\",\"type\":\"error\"},{\"inputs\":[],\"name\":\"ValidStep\",\"type\":\"error\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"uint256\",\"name\":\"parentIndex\",\"type\":\"uint256\"},{\"indexed\":true,\"internalType\":\"Claim\",\"name\":\"claim\",\"type\":\"bytes32\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"claimant\",\"type\":\"address\"}],\"name\":\"Move\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"enumGameStatus\",\"name\":\"status\",\"type\":\"uint8\"}],\"name\":\"Resolved\",\"type\":\"event\"},{\"inputs\":[],\"name\":\"ABSOLUTE_PRESTATE\",\"outputs\":[{\"internalType\":\"Claim\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"MAX_GAME_DEPTH\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"VM\",\"outputs\":[{\"internalType\":\"contractIBigStepper\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"_parentIndex\",\"type\":\"uint256\"},{\"internalType\":\"Claim\",\"name\":\"_claim\",\"type\":\"bytes32\"}],\"name\":\"attack\",\"outputs\":[],\"stateMutability\":\"payable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"bondManager\",\"outputs\":[{\"internalType\":\"contractIBondManager\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"claimData\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"parentIndex\",\"type\":\"uint32\"},{\"internalType\":\"bool\",\"name\":\"countered\",\"type\":\"bool\"},{\"internalType\":\"Claim\",\"name\":\"claim\",\"type\":\"bytes32\"},{\"internalType\":\"Position\",\"name\":\"position\",\"type\":\"uint128\"},{\"internalType\":\"Clock\",\"name\":\"clock\",\"type\":\"uint128\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"claimDataLen\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"len_\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"createdAt\",\"outputs\":[{\"internalType\":\"Timestamp\",\"name\":\"createdAt_\",\"type\":\"uint64\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"_parentIndex\",\"type\":\"uint256\"},{\"internalType\":\"Claim\",\"name\":\"_claim\",\"type\":\"bytes32\"}],\"name\":\"defend\",\"outputs\":[],\"stateMutability\":\"payable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"extraData\",\"outputs\":[{\"internalType\":\"bytes\",\"name\":\"extraData_\",\"type\":\"bytes\"}],\"stateMutability\":\"pure\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"gameData\",\"outputs\":[{\"internalType\":\"GameType\",\"name\":\"gameType_\",\"type\":\"uint8\"},{\"internalType\":\"Claim\",\"name\":\"rootClaim_\",\"type\":\"bytes32\"},{\"internalType\":\"bytes\",\"name\":\"extraData_\",\"type\":\"bytes\"}],\"stateMutability\":\"pure\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"gameStart\",\"outputs\":[{\"internalType\":\"Timestamp\",\"name\":\"\",\"type\":\"uint64\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"gameType\",\"outputs\":[{\"internalType\":\"GameType\",\"name\":\"gameType_\",\"type\":\"uint8\"}],\"stateMutability\":\"pure\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"initialize\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"l2BlockNumber\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"l2BlockNumber_\",\"type\":\"uint256\"}],\"stateMutability\":\"pure\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"_challengeIndex\",\"type\":\"uint256\"},{\"internalType\":\"Claim\",\"name\":\"_claim\",\"type\":\"bytes32\"},{\"internalType\":\"bool\",\"name\":\"_isAttack\",\"type\":\"bool\"}],\"name\":\"move\",\"outputs\":[],\"stateMutability\":\"payable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"resolve\",\"outputs\":[{\"internalType\":\"enumGameStatus\",\"name\":\"status_\",\"type\":\"uint8\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"rootClaim\",\"outputs\":[{\"internalType\":\"Claim\",\"name\":\"rootClaim_\",\"type\":\"bytes32\"}],\"stateMutability\":\"pure\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"status\",\"outputs\":[{\"internalType\":\"enumGameStatus\",\"name\":\"\",\"type\":\"uint8\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"_claimIndex\",\"type\":\"uint256\"},{\"internalType\":\"bool\",\"name\":\"_isAttack\",\"type\":\"bool\"},{\"internalType\":\"bytes\",\"name\":\"_stateData\",\"type\":\"bytes\"},{\"internalType\":\"bytes\",\"name\":\"_proof\",\"type\":\"bytes\"}],\"name\":\"step\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"version\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"}]",
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 }
 
 // FaultDisputeGameABI is the input ABI used to generate the binding from.

op-bindings/bindings/faultdisputegame_more.go

@@ -13,7 +13,7 @@ const FaultDisputeGameStorageLayoutJSON = "{\"storage\":[{\"astId\":1000,\"contr
 
 var FaultDisputeGameStorageLayout = new(solc.StorageLayout)
 
-var FaultDisputeGameDeployedBin = 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+var FaultDisputeGameDeployedBin = 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
 func init() {
 	if err := json.Unmarshal([]byte(FaultDisputeGameStorageLayoutJSON), FaultDisputeGameStorageLayout); err != nil {

packages/contracts-bedrock/.gas-snapshot

@@ -83,12 +83,16 @@ FaucetTest:test_nonAdmin_drip_fails() (gas: 262520)
 FaucetTest:test_receive_succeeds() (gas: 17401)
 FaucetTest:test_withdraw_nonAdmin_reverts() (gas: 13145)
 FaucetTest:test_withdraw_succeeds() (gas: 78359)
-FaultDisputeGame_ResolvesCorrectly_CorrectRoot1:test_resolvesCorrectly_succeeds() (gas: 491839)
-FaultDisputeGame_ResolvesCorrectly_CorrectRoot2:test_resolvesCorrectly_succeeds() (gas: 495751)
-FaultDisputeGame_ResolvesCorrectly_CorrectRoot3:test_resolvesCorrectly_succeeds() (gas: 495049)
-FaultDisputeGame_ResolvesCorrectly_IncorrectRoot1:test_resolvesCorrectly_succeeds() (gas: 490600)
-FaultDisputeGame_ResolvesCorrectly_IncorrectRoot2:test_resolvesCorrectly_succeeds() (gas: 494512)
-FaultDisputeGame_ResolvesCorrectly_IncorrectRoot3:test_resolvesCorrectly_succeeds() (gas: 493810)
+FaultDisputeGame_ResolvesCorrectly_CorrectRoot1:test_resolvesCorrectly_succeeds() (gas: 498900)
+FaultDisputeGame_ResolvesCorrectly_CorrectRoot2:test_resolvesCorrectly_succeeds() (gas: 503381)
+FaultDisputeGame_ResolvesCorrectly_CorrectRoot3:test_resolvesCorrectly_succeeds() (gas: 502679)
+FaultDisputeGame_ResolvesCorrectly_CorrectRoot4:test_resolvesCorrectly_succeeds() (gas: 505608)
+FaultDisputeGame_ResolvesCorrectly_CorrectRoot5:test_resolvesCorrectly_succeeds() (gas: 504939)
+FaultDisputeGame_ResolvesCorrectly_IncorrectRoot1:test_resolvesCorrectly_succeeds() (gas: 497692)
+FaultDisputeGame_ResolvesCorrectly_IncorrectRoot2:test_resolvesCorrectly_succeeds() (gas: 502173)
+FaultDisputeGame_ResolvesCorrectly_IncorrectRoot3:test_resolvesCorrectly_succeeds() (gas: 501471)
+FaultDisputeGame_ResolvesCorrectly_IncorrectRoot4:test_resolvesCorrectly_succeeds() (gas: 502373)
+FaultDisputeGame_ResolvesCorrectly_IncorrectRoot5:test_resolvesCorrectly_succeeds() (gas: 501731)
 FaultDisputeGame_Test:test_extraData_succeeds() (gas: 17426)
 FaultDisputeGame_Test:test_gameData_succeeds() (gas: 17917)
 FaultDisputeGame_Test:test_gameStart_succeeds() (gas: 10315)

packages/contracts-bedrock/contracts/dispute/FaultDisputeGame.sol

@@ -59,7 +59,7 @@ contract FaultDisputeGame is IFaultDisputeGame, Clone, Semver {
         Claim _absolutePrestate,
         uint256 _maxGameDepth,
         IBigStepper _vm
-    ) Semver(0, 0, 2) {
+    ) Semver(0, 0, 3) {
         ABSOLUTE_PRESTATE = _absolutePrestate;
         MAX_GAME_DEPTH = _maxGameDepth;
         VM = _vm;
@@ -92,7 +92,7 @@ contract FaultDisputeGame is IFaultDisputeGame, Clone, Semver {
 
         // Determine the expected pre & post states of the step.
         Claim preStateClaim;
-        Claim postStateClaim;
+        ClaimData storage postState;
         if (_isAttack) {
             if (stepPos.indexAtDepth() == 0) {
                 // If the step position's index at depth is 0, the prestate is the absolute
@@ -104,16 +104,16 @@ contract FaultDisputeGame is IFaultDisputeGame, Clone, Semver {
                 preStateClaim = findTraceAncestor(
                     Position.wrap(Position.unwrap(parentPos) - 1),
                     parent.parentIndex
-                );
+                ).claim;
             }
 
             // For all attacks, the poststate is the parent claim.
-            postStateClaim = parent.claim;
+            postState = parent;
         } else {
             // If the step is a defense, the poststate exists elsewhere in the game state,
             // and the parent claim is the expected pre-state.
             preStateClaim = parent.claim;
-            postStateClaim = findTraceAncestor(
+            postState = findTraceAncestor(
                 Position.wrap(Position.unwrap(parentPos) + 1),
                 parent.parentIndex
             );
@@ -123,10 +123,21 @@ contract FaultDisputeGame is IFaultDisputeGame, Clone, Semver {
         //            preimage of the prestate claim hash.
         if (keccak256(_stateData) != Claim.unwrap(preStateClaim)) revert InvalidPrestate();
 
-        // INVARIANT: A VM step can never counter a parent claim unless it produces a poststate
-        //            that is not equal to the claim at `_parentIndex` if the step is an attack,
-        //            or the claim at `_stateIndex` if the step is a defense.
-        if (VM.step(_stateData, _proof) == Claim.unwrap(postStateClaim)) revert ValidStep();
+        // INVARIANT: If a step is an attack, the poststate is valid if the step produces
+        //            the same poststate hash as the parent claim's value.
+        //            If a step is a defense:
+        //              1. If the parent claim and the found post state agree with each other
+        //                 (depth diff % 2 == 0), the step is valid if it produces the same
+        //                 state hash as the post state's claim.
+        //              2. If the parent claim and the found post state disagree with each other
+        //                 (depth diff % 2 != 0), the parent cannot be countered unless the step
+        //                 produces the same state hash as `postState.claim`.
+        // SAFETY:    While the `attack` path does not need an extra check for the post
+        //            state's depth in relation to the parent, we don't need another
+        //            branch because (n - n) % 2 == 0.
+        bool validStep = VM.step(_stateData, _proof) == Claim.unwrap(postState.claim);
+        bool parentPostAgree = (parentPos.depth() - postState.position.depth()) % 2 == 0;
+        if ((parentPostAgree && validStep) || (!parentPostAgree && !validStep)) revert ValidStep();
 
         // Set the parent claim as countered. We do not need to append a new claim to the game;
         // instead, we can just set the existing parent as countered.
@@ -384,17 +395,16 @@ contract FaultDisputeGame is IFaultDisputeGame, Clone, Semver {
     function findTraceAncestor(Position _pos, uint256 _start)
         internal
         view
-        returns (Claim ancestor_)
+        returns (ClaimData storage ancestor_)
     {
         // Grab the trace ancestor's expected position.
         Position preStateTraceAncestor = _pos.traceAncestor();
 
         // Walk up the DAG to find a claim that commits to the same trace index as `_pos`. It is
         // guaranteed that such a claim exists.
-        ClaimData storage ancestor = claimData[_start];
-        while (Position.unwrap(ancestor.position) != Position.unwrap(preStateTraceAncestor)) {
-            ancestor = claimData[ancestor.parentIndex];
+        ancestor_ = claimData[_start];
+        while (Position.unwrap(ancestor_.position) != Position.unwrap(preStateTraceAncestor)) {
+            ancestor_ = claimData[ancestor_.parentIndex];
         }
-        ancestor_ = ancestor.claim;
     }
 }

packages/contracts-bedrock/contracts/test/FaultDisputeGame.t.sol

@@ -473,6 +473,14 @@ contract GamePlayer {
                     counterParty.play(gameProxy.claimDataLen() - 1);
                 }
             } else {
+                // Don't defend a claim we would've made ourselves.
+                if (
+                    parentPos.depth() % 2 == 0 &&
+                    Claim.unwrap(claimAt(15)) == Claim.unwrap(gameProxy.rootClaim())
+                ) {
+                    return;
+                }
+
                 // Defend the parent claim.
                 gameProxy.defend(_parentIndex, ourClaim);
                 // Call out to our counter party to respond.
@@ -488,12 +496,23 @@ contract GamePlayer {
 
     /// @notice Returns the state at the trace index within the player's trace.
     function traceAt(uint256 _traceIndex) public view returns (uint256 state_) {
-        return uint256(uint8(trace[_traceIndex]));
+        return
+            uint256(
+                uint8(_traceIndex >= trace.length ? trace[trace.length - 1] : trace[_traceIndex])
+            );
     }
 
     /// @notice Returns the player's claim that commits to a given trace index.
     function claimAt(uint256 _traceIndex) public view returns (Claim claim_) {
-        return Claim.wrap(keccak256(abi.encode(_traceIndex, traceAt(_traceIndex))));
+        return
+            Claim.wrap(
+                keccak256(
+                    abi.encode(
+                        _traceIndex >= trace.length ? trace.length - 1 : _traceIndex,
+                        traceAt(_traceIndex)
+                    )
+                )
+            );
     }
 
     /// @notice Returns the player's claim that commits to a given trace index.
@@ -512,8 +531,14 @@ contract OneVsOne_Arena is FaultDisputeGame_Init {
     /// @dev The challenger.
     GamePlayer internal challenger;
 
-    function init(GamePlayer _defender, GamePlayer _challenger) public {
-        Claim rootClaim = Claim.wrap(keccak256(abi.encode(15, _defender.traceAt(15))));
+    function init(
+        GamePlayer _defender,
+        GamePlayer _challenger,
+        uint256 _finalTraceIndex
+    ) public {
+        Claim rootClaim = Claim.wrap(
+            keccak256(abi.encode(_finalTraceIndex, _defender.traceAt(_finalTraceIndex)))
+        );
         super.init(rootClaim, ABSOLUTE_PRESTATE_CLAIM);
         defender = _defender;
         challenger = _challenger;
@@ -532,7 +557,7 @@ contract FaultDisputeGame_ResolvesCorrectly_IncorrectRoot1 is OneVsOne_Arena {
     function setUp() public override {
         GamePlayer honest = new HonestPlayer(ABSOLUTE_PRESTATE);
         GamePlayer dishonest = new FullyDivergentPlayer(ABSOLUTE_PRESTATE);
-        super.init(dishonest, honest);
+        super.init(dishonest, honest, 15);
     }
 
     function test_resolvesCorrectly_succeeds() public {
@@ -553,7 +578,7 @@ contract FaultDisputeGame_ResolvesCorrectly_CorrectRoot1 is OneVsOne_Arena {
     function setUp() public override {
         GamePlayer honest = new HonestPlayer(ABSOLUTE_PRESTATE);
         GamePlayer dishonest = new FullyDivergentPlayer(ABSOLUTE_PRESTATE);
-        super.init(honest, dishonest);
+        super.init(honest, dishonest, 15);
     }
 
     function test_resolvesCorrectly_succeeds() public {
@@ -574,7 +599,7 @@ contract FaultDisputeGame_ResolvesCorrectly_IncorrectRoot2 is OneVsOne_Arena {
     function setUp() public override {
         GamePlayer honest = new HonestPlayer(ABSOLUTE_PRESTATE);
         GamePlayer dishonest = new HalfDivergentPlayer(ABSOLUTE_PRESTATE);
-        super.init(dishonest, honest);
+        super.init(dishonest, honest, 15);
     }
 
     function test_resolvesCorrectly_succeeds() public {
@@ -595,7 +620,7 @@ contract FaultDisputeGame_ResolvesCorrectly_CorrectRoot2 is OneVsOne_Arena {
     function setUp() public override {
         GamePlayer honest = new HonestPlayer(ABSOLUTE_PRESTATE);
         GamePlayer dishonest = new HalfDivergentPlayer(ABSOLUTE_PRESTATE);
-        super.init(honest, dishonest);
+        super.init(honest, dishonest, 15);
     }
 
     function test_resolvesCorrectly_succeeds() public {
@@ -616,7 +641,7 @@ contract FaultDisputeGame_ResolvesCorrectly_IncorrectRoot3 is OneVsOne_Arena {
     function setUp() public override {
         GamePlayer honest = new HonestPlayer(ABSOLUTE_PRESTATE);
         GamePlayer dishonest = new EarlyDivergentPlayer(ABSOLUTE_PRESTATE);
-        super.init(dishonest, honest);
+        super.init(dishonest, honest, 15);
     }
 
     function test_resolvesCorrectly_succeeds() public {
@@ -637,7 +662,91 @@ contract FaultDisputeGame_ResolvesCorrectly_CorrectRoot3 is OneVsOne_Arena {
     function setUp() public override {
         GamePlayer honest = new HonestPlayer(ABSOLUTE_PRESTATE);
         GamePlayer dishonest = new EarlyDivergentPlayer(ABSOLUTE_PRESTATE);
-        super.init(honest, dishonest);
+        super.init(honest, dishonest, 15);
+    }
+
+    function test_resolvesCorrectly_succeeds() public {
+        // Play the game until a step is forced.
+        challenger.play(0);
+
+        // Warp ahead to expire the other player's clock.
+        vm.warp(block.timestamp + 3 days + 12 hours + 1 seconds);
+
+        // Resolve the game and assert that the dishonest player challenged the root
+        // claim unsuccessfully.
+        assertEq(uint8(gameProxy.resolve()), uint8(GameStatus.DEFENDER_WINS));
+        assertTrue(challenger.failedToStep());
+    }
+}
+
+contract FaultDisputeGame_ResolvesCorrectly_IncorrectRoot4 is OneVsOne_Arena {
+    function setUp() public override {
+        GamePlayer honest = new HonestPlayer_HalfTrace(ABSOLUTE_PRESTATE);
+        GamePlayer dishonest = new DivergentPlayer_HalfTrace(ABSOLUTE_PRESTATE);
+        super.init(dishonest, honest, 7);
+    }
+
+    function test_resolvesCorrectly_succeeds() public {
+        // Play the game until a step is forced.
+        challenger.play(0);
+
+        // Warp ahead to expire the other player's clock.
+        vm.warp(block.timestamp + 3 days + 12 hours + 1 seconds);
+
+        // Resolve the game and assert that the honest player challenged the root
+        // claim successfully.
+        assertEq(uint8(gameProxy.resolve()), uint8(GameStatus.CHALLENGER_WINS));
+        assertFalse(challenger.failedToStep());
+    }
+}
+
+contract FaultDisputeGame_ResolvesCorrectly_CorrectRoot4 is OneVsOne_Arena {
+    function setUp() public override {
+        GamePlayer honest = new HonestPlayer_HalfTrace(ABSOLUTE_PRESTATE);
+        GamePlayer dishonest = new DivergentPlayer_HalfTrace(ABSOLUTE_PRESTATE);
+        super.init(honest, dishonest, 7);
+    }
+
+    function test_resolvesCorrectly_succeeds() public {
+        // Play the game until a step is forced.
+        challenger.play(0);
+
+        // Warp ahead to expire the other player's clock.
+        vm.warp(block.timestamp + 3 days + 12 hours + 1 seconds);
+
+        // Resolve the game and assert that the dishonest player challenged the root
+        // claim unsuccessfully.
+        assertEq(uint8(gameProxy.resolve()), uint8(GameStatus.DEFENDER_WINS));
+        assertTrue(challenger.failedToStep());
+    }
+}
+
+contract FaultDisputeGame_ResolvesCorrectly_IncorrectRoot5 is OneVsOne_Arena {
+    function setUp() public override {
+        GamePlayer honest = new HonestPlayer_QuarterTrace(ABSOLUTE_PRESTATE);
+        GamePlayer dishonest = new DivergentPlayer_QuarterTrace(ABSOLUTE_PRESTATE);
+        super.init(dishonest, honest, 3);
+    }
+
+    function test_resolvesCorrectly_succeeds() public {
+        // Play the game until a step is forced.
+        challenger.play(0);
+
+        // Warp ahead to expire the other player's clock.
+        vm.warp(block.timestamp + 3 days + 12 hours + 1 seconds);
+
+        // Resolve the game and assert that the honest player challenged the root
+        // claim successfully.
+        assertEq(uint8(gameProxy.resolve()), uint8(GameStatus.CHALLENGER_WINS));
+        assertFalse(challenger.failedToStep());
+    }
+}
+
+contract FaultDisputeGame_ResolvesCorrectly_CorrectRoot5 is OneVsOne_Arena {
+    function setUp() public override {
+        GamePlayer honest = new HonestPlayer_QuarterTrace(ABSOLUTE_PRESTATE);
+        GamePlayer dishonest = new DivergentPlayer_QuarterTrace(ABSOLUTE_PRESTATE);
+        super.init(honest, dishonest, 3);
     }
 
     function test_resolvesCorrectly_succeeds() public {
@@ -705,6 +814,52 @@ contract EarlyDivergentPlayer is GamePlayer {
     }
 }
 
+contract HonestPlayer_HalfTrace is GamePlayer {
+    constructor(bytes memory _absolutePrestate) {
+        uint8 absolutePrestate = uint8(_absolutePrestate[31]);
+        bytes memory halfTrace = new bytes(8);
+        for (uint8 i = 0; i < halfTrace.length; i++) {
+            halfTrace[i] = bytes1(absolutePrestate + i + 1);
+        }
+        trace = halfTrace;
+    }
+}
+
+contract DivergentPlayer_HalfTrace is GamePlayer {
+    constructor(bytes memory _absolutePrestate) {
+        uint8 absolutePrestate = uint8(_absolutePrestate[31]);
+        bytes memory halfTrace = new bytes(8);
+        for (uint8 i = 0; i < halfTrace.length; i++) {
+            // Diverge at trace instruction 5.
+            halfTrace[i] = i > 4 ? bytes1(i) : bytes1(absolutePrestate + i + 1);
+        }
+        trace = halfTrace;
+    }
+}
+
+contract HonestPlayer_QuarterTrace is GamePlayer {
+    constructor(bytes memory _absolutePrestate) {
+        uint8 absolutePrestate = uint8(_absolutePrestate[31]);
+        bytes memory halfTrace = new bytes(4);
+        for (uint8 i = 0; i < halfTrace.length; i++) {
+            halfTrace[i] = bytes1(absolutePrestate + i + 1);
+        }
+        trace = halfTrace;
+    }
+}
+
+contract DivergentPlayer_QuarterTrace is GamePlayer {
+    constructor(bytes memory _absolutePrestate) {
+        uint8 absolutePrestate = uint8(_absolutePrestate[31]);
+        bytes memory halfTrace = new bytes(4);
+        for (uint8 i = 0; i < halfTrace.length; i++) {
+            // Diverge at trace instruction 3.
+            halfTrace[i] = i > 2 ? bytes1(i) : bytes1(absolutePrestate + i + 1);
+        }
+        trace = halfTrace;
+    }
+}
+
 ////////////////////////////////////////////////////////////////
 //                          MOCK VMS                          //
 ////////////////////////////////////////////////////////////////