delta create swiss chess problem composer erich brunner come small board x rectangle x square triangular piece color extra piece colorin delta enter initial piece free placement player alternate move piece color x board space vertically horizontally diagonally place new piece space pass move piece goal create line piece color prevent player able winner score point space make line point stalemate opponent individual round brief round usually play series overall winner reach predetermine number point neodelta similar play x board player use color piece place player second form line draw possible

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