20 ... Qa1xRd1+!! creates a mating double check a la Reti-Tart C Li vs X Bu, 2009  (C42) Petrov Defense, 20 moves, 0-1 20 ... Nf2-g4++ Black g4-knight,b2-rook both immune to capture Lasker vs S Polner, 1889  (C26) Vienna, 21 moves, 0-1 White sacrifices his queen for 34 Bg4-e6++ and 35 Rg3-g8# I Nei vs Petrosian, 1960  (A56) Benoni Defense, 33 moves, 1-0 28 Ne4-g5++! 1-0 interposes Black's discovered check on g-file R Garcia vs E Figueroa, 1963  (A10) English, 28 moves, 1-0 4 games