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bugfix: threefold repitition throws nullpointer

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If the threefold repitition check is called before enough moves
are saved in the previous board state it throws a nullpointer.
A simple null check solves the problem
This commit is contained in:
TiynGER
2021-05-01 01:54:16 +02:00
parent 91281d97a7
commit 5bee0f84d2
1 changed files with 2 additions and 0 deletions
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src/chess.nim
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@@ -810,6 +810,8 @@ proc isCheckmate*(game: Game, color: Color): bool =
proc threeMoveRep(game: Game): bool = proc threeMoveRep(game: Game): bool =
## Returns true if a 3-fold repitition happened on the last move of the ## Returns true if a 3-fold repitition happened on the last move of the
## `game`. ## `game`.
if game.previousBoard == []:
return false
var lastState = game.previousBoard[game.previousBoard.high] var lastState = game.previousBoard[game.previousBoard.high]
var lastCastleRights = game.previousCastleRights[game.previousBoard.high] var lastCastleRights = game.previousCastleRights[game.previousBoard.high]
var reps = 0 var reps = 0