CHESS SOLUTION:

1 Ba4 ! (threat 2 b5) b5 (forced) 2 Bxb5, Ke8; 3 Ba4, Kd8 (now 4 b5 fails as c7 is adequately defended) 4 h4 ! , 1 – 0

After Black's remaining pawn moves are exhausted, he will have to move a piece which will result in decisive material loss