TwixT_for_open_spiel

C++ implementation of the board game TwixT for deepmind's framework open_spiel.

Installation

• clone deepmind's open_spiel repository
• follow the installation instructions but do not run the build script yet.
• clone this repository
• copy the files TwixT_for_open_spiel/open_spiel/games/twixt* into open_spiel/open_spiel/games
• edit open_spiel/open_spiel/games/CMakeLists.txt and add the following lines

...
twixt.cc
twixt.h
twixtboard.cc
twixtboard.h
twixtcell.h 
...

...
add_executable(twixt_test twixt_test.cc ${OPEN_SPIEL_OBJECTS}
               $<TARGET_OBJECTS:tests>)
add_test(twixt_test twixt_test)
...

• edit open_spiel/open_spiel/python/tests/pyspiel_test.py and add "twixt" to the list of games.
• copy file TwixT_for_open_spiel/open_spiel/integration_tests/playthroughs/twixt.txt into open_spiel/open_spiel/integration_tests/playthroughs/
• build the targets as described here

Examples

./build/examples/example --game=twixt

./build/examples/mcts_example --game="twixt(board_size=12)"

./build/examples/mcts_example --game=twixt -player1=mcts --player2=mcts --max_simulations=20000 --rollout_count=4 --verbose=true

python ./open_spiel/python/examples/example.py --game=twixt\(board_size=12,ansi_color_output=False\)

• board_size must be in [5..24], default=8
• ansi_color_output must be True|False, default True

Rules

• this is a paper-and-pencil variant of TwixT without link removal and without crossing of own links.
• player 0 (x, red) has the top/bottom endlines, player 1 (o, blue) has the left/right endlines.
• if a player has no more legal moves left - when it's his turn - the game is a draw.
• player 1 (o, blue) can swap player 0's first move by choosing the same move again - unless it is on an endline.