PyGameExamplesAndAnswers

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Grid

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Draw grid

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Performance and lag

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Position in grid, grid index

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Click in grid

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Diagonal

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Move in grid

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Drag in grid

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Chess board, checker texture

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Grid an NumPy

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import numpy

board = [
    ["bR", "bN", "bB", "bQ", "bK", "bB", "bN", "bR"],
    ["bp", "bp", "bp", "bp", "bp", "bp", "bp", "bp"],
    ["--", "--", "--", "--", "--", "--", "--", "--"],
    ["--", "--", "--", "--", "--", "--", "--", "--"],
    ["--", "--", "--", "--", "--", "--", "--", "--"],
    ["--", "--", "--", "--", "--", "--", "--", "--"],
    ["wp", "wp", "wp", "wp", "wp", "wp", "wp", "wp"],
    ["wR", "wN", "wB", "wQ", "wK", "wB", "wN", "wR"]
]

values, indices = numpy.unique(board, return_inverse=True)
indices = indices.reshape((8, 8))

print(values, '\n')
print(indices)

lookup = {
    "--": 0,
    "wK": 1, "wQ": 2, "wR": 3, "wB": 4, "wN": 5, "wp": 6,
    "bK": 7, "bQ": 8, "bR": 9, "bB": 10, "bN": 11, "bp": 12 
}
indices = numpy.array([[lookup[p] for p in row] for row in board])

print(indices)