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Fix for TicTacToeEnv allows illegal moves #1001 #1094

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Fix for TicTacToeEnv allows illegal moves #1001 #1094

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1 change: 1 addition & 0 deletions src/ReinforcementLearningEnvironments/src/environments/examples/TicTacToeEnv.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -60,6 +60,7 @@ end
RLBase.act!(env::TicTacToeEnv, action::Int) = RLBase.act!(env, CartesianIndices((3, 3))[action])

function RLBase.act!(env::TicTacToeEnv, action::CartesianIndex{2})
!env.board[action,1] && error("The state has already been played.")
env.board[action, 1] = false
env.board[action, Base.to_index(env, current_player(env))] = true
end
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