6 corrected 1st 2 PGNs edited May 27 '19 at 14:57 Rosie F 3,44611 gold badge1111 silver badges2525 bronze badges The Matt Bengtson problem Prof. Elkies mentions is: ``````[Title "Matt Bengtson, Chess Braintwisters (Burt Hochberg), no. 103. White to move & draw."] [FEN "4kn2/3p1pPp/4pPpK/6P1/8/2p5/1b6/8 bw - - 0 1"] `````` The start of the solution-line can't be shown in PGN as White's 1st move is illegal: 1. g8=Black queen Qg7+ (anything else stalemates White) 2. fxg7 c2 3. g8=Q c1=Q 4. Qxf7+ Kd8 5. Qe8+ Kc7 6. Qc8+ Kb6 (Kd6 7. Qc5+) 7. Qc6+ Ka7/Ka5 8. Qb7/Qb5, drawing. White's queen is then taken for stalemate. Solution line taken from Chess Braintwisters. ``````[Title "A Visual Solution Minus The Illegal Move"] [StartFlipped "0"] [FEN "4knq1/3p1p1p/4pPpK/6P1/8/2p5/1b6/8 b - - 0 1"] 1... Qg7+ 2. fxg7 c2 3. g8=Q c1=Q 4. Qxf7+ Kd8 5. Qe8+ Kc7 6. Qc8+ Kb6 7. Qc6+ Ka5 8. Qb5+ Kxb5 `````` (This is in answer to a comment by Prof. Elkies to Dag Oskar Madsen's answer, but, it seems, the syntax that activates the PGN-viewer in answers doesn't do so in comments.) A similar oddity from the same book: ``````[Title "John Beasley, EBUR, 1996. White to move & win."] [fen "5r1K/2k1P3/3N1Bqp/N2Q1B1P/8/8/8/1R6 w - - 0 0"] `````` This problem was reprinted as no. 107 in Burt Hochberg's Chess Braintwisters. White is in check, and his only reasonable move is to capture on f8 (1. Qg8? Qxg8#). But 1. exf8=R allows stalemate after 1. ... Qg7+ because the new rook guards d8 after 2. Bxg7. Similarly, 1. exf8=N guards d7 allowing 1. ... Qh7+ and stalemate, and 1. exf8=Q/B guards d6 allowing 1. ... Qg8+ and stalemate. The answer is 1. exf8! (no promotion). Now 1. ... Qg7+ 2. Bxg7 releases d8; 1. ... Qh7+ 2. Bxh7 releases d7; 1. ... Qg8 2. Qxg8 releases d6. 1. ... Qxf6+ destroys the stalemate at once, and White wins. Solution line and discussion taken from Chess Braintwisters. The Matt Bengtson problem Prof. Elkies mentions is: ``````[Title "Matt Bengtson, Chess Braintwisters (Burt Hochberg), no. 103. White to move & draw."] [FEN "4kn2/3p1pPp/4pPpK/6P1/8/2p5/1b6/8 b - - 0 1"] `````` The start of the solution-line can't be shown in PGN as White's 1st move is illegal: 1. g8=Black queen Qg7+ (anything else stalemates White) 2. fxg7 c2 3. g8=Q c1=Q 4. Qxf7+ Kd8 5. Qe8+ Kc7 6. Qc8+ Kb6 (Kd6 7. Qc5+) 7. Qc6+ Ka7/Ka5 8. Qb7/Qb5, drawing. White's queen is then taken for stalemate. Solution line taken from Chess Braintwisters. ``````[Title "A Visual Solution Minus The Illegal Move"] [FEN "4knq1/3p1p1p/4pPpK/6P1/8/2p5/1b6/8 b - - 0 1"] 1... Qg7+ 2. fxg7 c2 3. g8=Q c1=Q 4. Qxf7+ Kd8 5. Qe8+ Kc7 6. Qc8+ Kb6 7. Qc6+ Ka5 8. Qb5+ Kxb5 `````` (This is in answer to a comment by Prof. Elkies to Dag Oskar Madsen's answer, but, it seems, the syntax that activates the PGN-viewer in answers doesn't do so in comments.) A similar oddity from the same book: ``````[Title "John Beasley, EBUR, 1996. White to move & win."] [fen "5r1K/2k1P3/3N1Bqp/N2Q1B1P/8/8/8/1R6 w - - 0 0"] `````` This problem was reprinted as no. 107 in Burt Hochberg's Chess Braintwisters. White is in check, and his only reasonable move is to capture on f8 (1. Qg8? Qxg8#). But 1. exf8=R allows stalemate after 1. ... Qg7+ because the new rook guards d8 after 2. Bxg7. Similarly, 1. exf8=N guards d7 allowing 1. ... Qh7+ and stalemate, and 1. exf8=Q/B guards d6 allowing 1. ... Qg8+ and stalemate. The answer is 1. exf8! (no promotion). Now 1. ... Qg7+ 2. Bxg7 releases d8; 1. ... Qh7+ 2. Bxh7 releases d7; 1. ... Qg8 2. Qxg8 releases d6. 1. ... Qxf6+ destroys the stalemate at once, and White wins. Solution line and discussion taken from Chess Braintwisters. The Matt Bengtson problem Prof. Elkies mentions is: ``````[Title "Matt Bengtson, Chess Braintwisters (Burt Hochberg), no. 103. White to move & draw."] [FEN "4kn2/3p1pPp/4pPpK/6P1/8/2p5/1b6/8 w - - 0 1"] `````` The start of the solution-line can't be shown in PGN as White's 1st move is illegal: 1. g8=Black queen Qg7+ (anything else stalemates White) 2. fxg7 c2 3. g8=Q c1=Q 4. Qxf7+ Kd8 5. Qe8+ Kc7 6. Qc8+ Kb6 (Kd6 7. Qc5+) 7. Qc6+ Ka7/Ka5 8. Qb7/Qb5, drawing. White's queen is then taken for stalemate. Solution line taken from Chess Braintwisters. ``````[Title "A Visual Solution Minus The Illegal Move"] [StartFlipped "0"] [FEN "4knq1/3p1p1p/4pPpK/6P1/8/2p5/1b6/8 b - - 0 1"] 1... Qg7+ 2. fxg7 c2 3. g8=Q c1=Q 4. Qxf7+ Kd8 5. Qe8+ Kc7 6. Qc8+ Kb6 7. Qc6+ Ka5 8. Qb5+ Kxb5 `````` (This is in answer to a comment by Prof. Elkies to Dag Oskar Madsen's answer, but, it seems, the syntax that activates the PGN-viewer in answers doesn't do so in comments.) A similar oddity from the same book: ``````[Title "John Beasley, EBUR, 1996. White to move & win."] [fen "5r1K/2k1P3/3N1Bqp/N2Q1B1P/8/8/8/1R6 w - - 0 0"] `````` This problem was reprinted as no. 107 in Burt Hochberg's Chess Braintwisters. White is in check, and his only reasonable move is to capture on f8 (1. Qg8? Qxg8#). But 1. exf8=R allows stalemate after 1. ... Qg7+ because the new rook guards d8 after 2. Bxg7. Similarly, 1. exf8=N guards d7 allowing 1. ... Qh7+ and stalemate, and 1. exf8=Q/B guards d6 allowing 1. ... Qg8+ and stalemate. The answer is 1. exf8! (no promotion). Now 1. ... Qg7+ 2. Bxg7 releases d8; 1. ... Qh7+ 2. Bxh7 releases d7; 1. ... Qg8 2. Qxg8 releases d6. 1. ... Qxf6+ destroys the stalemate at once, and White wins. Solution line and discussion taken from Chess Braintwisters. 5 A PGN for visual learners-it hurts my brain trying to do it in my head. edited May 27 '19 at 13:15 Rewan Demontay 4,46333 gold badges1515 silver badges4343 bronze badges The Matt Bengtson problem Prof. Elkies mentions is: ``````[Title "Matt Bengtson, Chess Braintwisters (Burt Hochberg), no. 103. White to move & draw."] [FEN "4kn2/3p1pPp/4pPpK/6P1/8/2p5/1b6/8 b - - 0 1"] `````` ``````[Title "The Game After The Illegal Move"] [FEN "4knq1/3p1p1p/4pPpK/6P1/8/2p5/1b6/8 b - - 0 1"] `````` The start of the solution-line can't be shown in PGN as White's 1st move is illegal: 1. g8=Black queen Qg7+ (anything else stalemates White) 2. fxg7 c2 3. g8=Q c1=Q 4. Qxf7+ Kd8 5. Qe8+ Kc7 6. Qc8+ Kb6 (Kd6 7. Qc5+) 7. Qc6+ Ka7/Ka5 8. Qb7/Qb5, drawing. White's queen is then taken for stalemate. Solution line taken from Chess Braintwisters. ``````[Title "A Visual Solution Minus The Illegal Move"] [FEN "4knq1/3p1p1p/4pPpK/6P1/8/2p5/1b6/8 b - - 0 1"] 1... Qg7+ 2. fxg7 c2 3. g8=Q c1=Q 4. Qxf7+ Kd8 5. Qe8+ Kc7 6. Qc8+ Kb6 7. Qc6+ Ka5 8. Qb5+ Kxb5 `````` (This is in answer to a comment by Prof. Elkies to Dag Oskar Madsen's answer, but, it seems, the syntax that activates the PGN-viewer in answers doesn't do so in comments.) A similar oddity from the same book: ``````[Title "John Beasley, EBUR, 1996. White to move & win."] [fen "5r1K/2k1P3/3N1Bqp/N2Q1B1P/8/8/8/1R6 w - - 0 0"] `````` This problem was reprinted as no. 107 in Burt Hochberg's Chess Braintwisters. White is in check, and his only reasonable move is to capture on f8 (1. Qg8? Qxg8#). But 1. exf8=R allows stalemate after 1. ... Qg7+ because the new rook guards d8 after 2. Bxg7. Similarly, 1. exf8=N guards d7 allowing 1. ... Qh7+ and stalemate, and 1. exf8=Q/B guards d6 allowing 1. ... Qg8+ and stalemate. The answer is 1. exf8! (no promotion). Now 1. ... Qg7+ 2. Bxg7 releases d8; 1. ... Qh7+ 2. Bxh7 releases d7; 1. ... Qg8 2. Qxg8 releases d6. 1. ... Qxf6+ destroys the stalemate at once, and White wins. Solution line and discussion taken from Chess Braintwisters. The Matt Bengtson problem Prof. Elkies mentions is: ``````[Title "Matt Bengtson, Chess Braintwisters (Burt Hochberg), no. 103. White to move & draw."] [FEN "4kn2/3p1pPp/4pPpK/6P1/8/2p5/1b6/8 b - - 0 1"] `````` ``````[Title "The Game After The Illegal Move"] [FEN "4knq1/3p1p1p/4pPpK/6P1/8/2p5/1b6/8 b - - 0 1"] `````` The start of the solution-line can't be shown in PGN as White's 1st move is illegal: 1. g8=Black queen Qg7+ (anything else stalemates White) 2. fxg7 c2 3. g8=Q c1=Q 4. Qxf7+ Kd8 5. Qe8+ Kc7 6. Qc8+ Kb6 (Kd6 7. Qc5+) 7. Qc6+ Ka7/Ka5 8. Qb7/Qb5, drawing. White's queen is then taken for stalemate. Solution line taken from Chess Braintwisters. (This is in answer to a comment by Prof. Elkies to Dag Oskar Madsen's answer, but, it seems, the syntax that activates the PGN-viewer in answers doesn't do so in comments.) A similar oddity from the same book: ``````[Title "John Beasley, EBUR, 1996. White to move & win."] [fen "5r1K/2k1P3/3N1Bqp/N2Q1B1P/8/8/8/1R6 w - - 0 0"] `````` This problem was reprinted as no. 107 in Burt Hochberg's Chess Braintwisters. White is in check, and his only reasonable move is to capture on f8 (1. Qg8? Qxg8#). But 1. exf8=R allows stalemate after 1. ... Qg7+ because the new rook guards d8 after 2. Bxg7. Similarly, 1. exf8=N guards d7 allowing 1. ... Qh7+ and stalemate, and 1. exf8=Q/B guards d6 allowing 1. ... Qg8+ and stalemate. The answer is 1. exf8! (no promotion). Now 1. ... Qg7+ 2. Bxg7 releases d8; 1. ... Qh7+ 2. Bxh7 releases d7; 1. ... Qg8 2. Qxg8 releases d6. 1. ... Qxf6+ destroys the stalemate at once, and White wins. Solution line and discussion taken from Chess Braintwisters. The Matt Bengtson problem Prof. Elkies mentions is: ``````[Title "Matt Bengtson, Chess Braintwisters (Burt Hochberg), no. 103. White to move & draw."] [FEN "4kn2/3p1pPp/4pPpK/6P1/8/2p5/1b6/8 b - - 0 1"] `````` The start of the solution-line can't be shown in PGN as White's 1st move is illegal: 1. g8=Black queen Qg7+ (anything else stalemates White) 2. fxg7 c2 3. g8=Q c1=Q 4. Qxf7+ Kd8 5. Qe8+ Kc7 6. Qc8+ Kb6 (Kd6 7. Qc5+) 7. Qc6+ Ka7/Ka5 8. Qb7/Qb5, drawing. White's queen is then taken for stalemate. Solution line taken from Chess Braintwisters. ``````[Title "A Visual Solution Minus The Illegal Move"] [FEN "4knq1/3p1p1p/4pPpK/6P1/8/2p5/1b6/8 b - - 0 1"] 1... Qg7+ 2. fxg7 c2 3. g8=Q c1=Q 4. Qxf7+ Kd8 5. Qe8+ Kc7 6. Qc8+ Kb6 7. Qc6+ Ka5 8. Qb5+ Kxb5 `````` (This is in answer to a comment by Prof. Elkies to Dag Oskar Madsen's answer, but, it seems, the syntax that activates the PGN-viewer in answers doesn't do so in comments.) A similar oddity from the same book: ``````[Title "John Beasley, EBUR, 1996. White to move & win."] [fen "5r1K/2k1P3/3N1Bqp/N2Q1B1P/8/8/8/1R6 w - - 0 0"] `````` This problem was reprinted as no. 107 in Burt Hochberg's Chess Braintwisters. White is in check, and his only reasonable move is to capture on f8 (1. Qg8? Qxg8#). But 1. exf8=R allows stalemate after 1. ... Qg7+ because the new rook guards d8 after 2. Bxg7. Similarly, 1. exf8=N guards d7 allowing 1. ... Qh7+ and stalemate, and 1. exf8=Q/B guards d6 allowing 1. ... Qg8+ and stalemate. The answer is 1. exf8! (no promotion). Now 1. ... Qg7+ 2. Bxg7 releases d8; 1. ... Qh7+ 2. Bxh7 releases d7; 1. ... Qg8 2. Qxg8 releases d6. 1. ... Qxf6+ destroys the stalemate at once, and White wins. Solution line and discussion taken from Chess Braintwisters. 4 A PGN for visual learners-it hurts my brain trying to do it in my head. edited May 27 '19 at 13:10 Rewan Demontay 4,46333 gold badges1515 silver badges4343 bronze badges The Matt Bengtson problem Prof. Elkies mentions is: ``````[Title "Matt Bengtson, Chess Braintwisters (Burt Hochberg), no. 103. White to move & draw."] [fen[FEN "4kn2/3p1pPp/4pPpK/6P1/8/2p5/1b6/8 wb - - 0 0"]1"] `````` ``````[Title "The Game After The Illegal Move"] 1.[FEN "4knq1/3p1p1p/4pPpK/6P1/8/2p5/1b6/8 b - - 0 1"] ``````  The start of the solution-line can't be shown in PGN as White's 1st move is illegal: 1. g8=Black queen Qg7+ (anything else stalemates White) 2. fxg7 c2 3. g8=Q c1=Q 4. Qxf7+ Kd8 5. Qe8+ Kc7 6. Qc8+ Kb6 (Kd6 7. Qc5+) 7. Qc6+ Ka7/Ka5 8. Qb7/Qb5, drawing. White's queen is then taken for stalemate. Solution line taken from Chess Braintwisters. (This is in answer to a comment by Prof. Elkies to Dag Oskar Madsen's answer, but, it seems, the syntax that activates the PGN-viewer in answers doesn't do so in comments.) A similar oddity from the same book: ``````[Title "John Beasley, EBUR, 1996. White to move & win."] [fen "5r1K/2k1P3/3N1Bqp/N2Q1B1P/8/8/8/1R6 w - - 0 0"] `````` This problem was reprinted as no. 107 in Burt Hochberg's Chess Braintwisters. White is in check, and his only reasonable move is to capture on f8 (1. Qg8? Qxg8#). But 1. exf8=R allows stalemate after 1. ... Qg7+ because the new rook guards d8 after 2. Bxg7. Similarly, 1. exf8=N guards d7 allowing 1. ... Qh7+ and stalemate, and 1. exf8=Q/B guards d6 allowing 1. ... Qg8+ and stalemate. The answer is 1. exf8! (no promotion). Now 1. ... Qg7+ 2. Bxg7 releases d8; 1. ... Qh7+ 2. Bxh7 releases d7; 1. ... Qg8 2. Qxg8 releases d6. 1. ... Qxf6+ destroys the stalemate at once, and White wins. Solution line and discussion taken from Chess Braintwisters. The Matt Bengtson problem Prof. Elkies mentions is: ``````[Title "Matt Bengtson, Chess Braintwisters (Burt Hochberg), no. 103. White to move & draw."] [fen "4kn2/3p1pPp/4pPpK/6P1/8/2p5/1b6/8 w - - 0 0"] 1. `````` The start of the solution-line can't be shown in PGN as White's 1st move is illegal: 1. g8=Black queen Qg7+ (anything else stalemates White) 2. fxg7 c2 3. g8=Q c1=Q 4. Qxf7+ Kd8 5. Qe8+ Kc7 6. Qc8+ Kb6 (Kd6 7. Qc5+) 7. Qc6+ Ka7/Ka5 8. Qb7/Qb5, drawing. White's queen is then taken for stalemate. Solution line taken from Chess Braintwisters. (This is in answer to a comment by Prof. Elkies to Dag Oskar Madsen's answer, but, it seems, the syntax that activates the PGN-viewer in answers doesn't do so in comments.) A similar oddity from the same book: ``````[Title "John Beasley, EBUR, 1996. White to move & win."] [fen "5r1K/2k1P3/3N1Bqp/N2Q1B1P/8/8/8/1R6 w - - 0 0"] `````` This problem was reprinted as no. 107 in Burt Hochberg's Chess Braintwisters. White is in check, and his only reasonable move is to capture on f8 (1. Qg8? Qxg8#). But 1. exf8=R allows stalemate after 1. ... Qg7+ because the new rook guards d8 after 2. Bxg7. Similarly, 1. exf8=N guards d7 allowing 1. ... Qh7+ and stalemate, and 1. exf8=Q/B guards d6 allowing 1. ... Qg8+ and stalemate. The answer is 1. exf8! (no promotion). Now 1. ... Qg7+ 2. Bxg7 releases d8; 1. ... Qh7+ 2. Bxh7 releases d7; 1. ... Qg8 2. Qxg8 releases d6. 1. ... Qxf6+ destroys the stalemate at once, and White wins. Solution line and discussion taken from Chess Braintwisters. The Matt Bengtson problem Prof. Elkies mentions is: ``````[Title "Matt Bengtson, Chess Braintwisters (Burt Hochberg), no. 103. White to move & draw."] [FEN "4kn2/3p1pPp/4pPpK/6P1/8/2p5/1b6/8 b - - 0 1"] `````` ``````[Title "The Game After The Illegal Move"] [FEN "4knq1/3p1p1p/4pPpK/6P1/8/2p5/1b6/8 b - - 0 1"] ``````  The start of the solution-line can't be shown in PGN as White's 1st move is illegal: 1. g8=Black queen Qg7+ (anything else stalemates White) 2. fxg7 c2 3. g8=Q c1=Q 4. Qxf7+ Kd8 5. Qe8+ Kc7 6. Qc8+ Kb6 (Kd6 7. Qc5+) 7. Qc6+ Ka7/Ka5 8. Qb7/Qb5, drawing. White's queen is then taken for stalemate. Solution line taken from Chess Braintwisters. (This is in answer to a comment by Prof. Elkies to Dag Oskar Madsen's answer, but, it seems, the syntax that activates the PGN-viewer in answers doesn't do so in comments.) A similar oddity from the same book: ``````[Title "John Beasley, EBUR, 1996. White to move & win."] [fen "5r1K/2k1P3/3N1Bqp/N2Q1B1P/8/8/8/1R6 w - - 0 0"] `````` This problem was reprinted as no. 107 in Burt Hochberg's Chess Braintwisters. White is in check, and his only reasonable move is to capture on f8 (1. Qg8? Qxg8#). But 1. exf8=R allows stalemate after 1. ... Qg7+ because the new rook guards d8 after 2. Bxg7. Similarly, 1. exf8=N guards d7 allowing 1. ... Qh7+ and stalemate, and 1. exf8=Q/B guards d6 allowing 1. ... Qg8+ and stalemate. The answer is 1. exf8! (no promotion). Now 1. ... Qg7+ 2. Bxg7 releases d8; 1. ... Qh7+ 2. Bxh7 releases d7; 1. ... Qg8 2. Qxg8 releases d6. 1. ... Qxf6+ destroys the stalemate at once, and White wins. Solution line and discussion taken from Chess Braintwisters. 3 correct a typo in my copying from Hochberg edited May 28 '16 at 4:02 Rosie F 3,44611 gold badge1111 silver badges2525 bronze badges 2 Provided a further example where wP reaches rank 8 & doesn't promote, as per comment. edited May 27 '16 at 17:16 Rosie F 3,44611 gold badge1111 silver badges2525 bronze badges 1 answered May 27 '16 at 16:09 Rosie F 3,44611 gold badge1111 silver badges2525 bronze badges