Checkmates for 4 pieces, page 489 by William Brett Fishburne
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4/8/8 b - - 0 0 1k4R1/8/1K6/8/8/3Q4/8/8 b - - 0 0 1k4R1/8/1K6/8/8/3R4/8/8 b - - 0 0 1k4R1/8/1K6/8/8/3b4/8/8 b - - 0 0 1k4R1/8/1K6/8/8/3n4/8/8 b - - 0 0 1k4R1/8/1K6/8/8/3p4/8/8 b - - 0 0 1k4R1/8/1K6/8/8/4B3/8/8 b - - 0 0 1k4R1/8/1K6/8/8/4N3/8/8 b - - 0 0 1k4R1/8/1K6/8/8/4P3/8/8 b - - 0 0 1k4R1/8/1K6/8/8/4Q3/8/8 b - - 0 0 1k4R1/8/1K6/8/8/4R3/8/8 b - - 0 0 1k4R1/8/1K6/8/8/4n3/8/8 b - - 0 0 1k4R1/8/1K6/8/8/4p3/8/8 b - - 0 0 1k4R1/8/1K6/8/8/5B2/8/8 b - - 0 0 1k4R1/8/1K6/8/8/5N2/8/8 b - - 0 0 1k4R1/8/1K6/8/8/5P2/8/8 b - - 0 0 1k4R1/8/1K6/8/8/5Q2/8/8 b - - 0 0 1k4R1/8/1K6/8/8/5R2/8/8 b - - 0 0 1k4R1/8/1K6/8/8/5b2/8/8 b - - 0 0 1k4R1/8/1K6/8/8/5n2/8/8 b - - 0 0 1k4R1/8/1K6/8/8/5p2/8/8 b - - 0 0 1k4R1/8/1K6/8/8/6B1/8/8 b - - 0 0 1k4R1/8/1K6/8/8/6N1/8/8 b - - 0 0 1k4R1/8/1K6/8/8/6P1/8/8 b - - 0 0 1k4R1/8/1K6/8/8/6Q1/8/8 b - - 0 0 1k4R1/8/1K6/8/8/6R1/8/8 b - - 0 0 1k4R1/8/1K6/8/8/6b1/8/8 b - - 0 0 1k4R1/8/1K6/8/8/6n1/8/8 b - - 0 0 1k4R1/8/1K6/8/8/6p1/8/8 b - - 0 0 1k4R1/8/1K6/8/8/7B/8/8 b - - 0 0 1k4R1/8/1K6/8/8/7N/8/8 b - - 0 0 1k4R1/8/1K6/8/8/7P/8/8 b - - 0 0 1k4R1/8/1K6/8/8/7Q/8/8 b - - 0 0 1k4R1/8/1K6/8/8/7R/8/8 b - - 0 0 1k4R1/8/1K6/8/8/7n/8/8 b - - 0 0 1k4R1/8/1K6/8/8/7p/8/8 b - - 0 0 1k4R1/8/1K6/8/8/7r/8/8 b - - 0 0 1k4R1/8/1K6/8/8/8/1B6/8 b - - 0 0 1k4R1/8/1K6/8/8/8/1N6/8 b - - 0 0 1k4R1/8/1K6/8/8/8/1P6/8 b - - 0 0 1k4R1/8/1K6/8/8/8/1Q6/8 b - - 0 0 1k4R1/8/1K6/8/8/8/1R6/8 b - - 0 0 1k4R1/8/1K6/8/8/8/1b6/8 b - - 0 0 1k4R1/8/1K6/8/8/8/1n6/8 b - - 0 0 1k4R1/8/1K6/8/8/8/1p6/8 b - - 0 0 1k4R1/8/1K6/8/8/8/2B5/8 b - - 0 0 1k4R1/8/1K6/8/8/8/2N5/8 b - - 0 0 1k4R1/8/1K6/8/8/8/2P5/8 b - - 0 0 1k4R1/8/1K6/8/8/8/2Q5/8 b - - 0 0 1k4R1/8/1K6/8/8/8/2R5/8 b - - 0 0 1k4R1/8/1K6/8/8/8/2b5/8 b - - 0 0 1k4R1/8/1K6/8/8/8/2n5/8 b - - 0 0 1k4R1/8/1K6/8/8/8/2p5/8 b - - 0 0 1k4R1/8/1K6/8/8/8/3B4/8 b - - 0 0 1k4R1/8/1K6/8/8/8/3N4/8 b - - 0 0 1k4R1/8/1K6/8/8/8/3P4/8 b - - 0 0 1k4R1/8/1K6/8/8/8/3Q4/8 b - - 0 0 1k4R1/8/1K6/8/8/8/3R4/8 b - - 0 0 1k4R1/8/1K6/8/8/8/3b4/8 b - - 0 0 1k4R1/8/1K6/8/8/8/3n4/8 b - - 0 0 1k4R1/8/1K6/8/8/8/3p4/8 b - - 0 0