A move of a piece passing the critical square to prevent it from being interfered in that square.
Thoren, Karl
Schackvärlden, 1929
Prize
mate in 3 moves
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Blog about chess problems
A move of a piece passing the critical square to prevent it from being interfered in that square.
Thoren, Karl
Schackvärlden, 1929
Prize
mate in 3 moves