White to play and checkmate in two moves

Problems 637 to 648

637

(Pieter ten Cate - The Austral 1st Prize, 1924)

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1.Qe7! ~ 2.Rxc6#
1...Qe5+ 2.Qxe5#
1...Ne6+ 2.Rd4#!
1...Nc2+ 2.Rf6#
1...Nxf5+ (Nxb5+) 2.Qe5#
1...cxb5 2.Na6#

Date added: 14/6/2021

638

(Gustaaf Josephus Nietvelt - British Chess Magazine 1st Prize, 1923)

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1.Qe8! (2.Nd5#)
1...Re5 2.Ng3#
1...Rxf5 2.Nxf5#
1...Rb6 2.Rd4#
1...Bc5 2.Qc6#
1...Bd4 2.Nd6#
1...Bb5 2.Nc6#
1...Nc4 2.Bxd3#
1...f2 2.Bg2#

Date added: 14/6/2021

639

(Henry Wald Bettmann - Good Companion 2nd Prize, Jan 1923)

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1.Rd7! ~
2.cxd8=N#
2.cxb8=N#
2.c8=Q#
2.c8=R#
1...Kxc6 2.cxb8=N#
1...Kc8 2.cxd8=Q#
1...Kxa7 2.c8=N#
1...Rc8 2.cxd8=N#
1...Nxc6 2.cxb8=Q#
1...Ne6 2.c8=Q#

Date added: 15/6/2021 (The 1.000th puzlle in my site)

640

(Charles Promislo - Boston Evening Transcript 2nd Prize, Cummings Memorial Change-Mate Tourney, 1919)

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1.Nf4!
1...Ng3 2.Ng2#
1...Nf2 2.Bd2#
1...d2 2.Qxd2#
1...dxe2 2.Qd2#
1...Kxf4 2.Bd2#
1...Qb3 (Qe6, Qf7) 2.Ng2#
1...Qc4 2.Ng2#
1...Qd5
2.Ng2#
2.Nxd5#
1...Qh7
2.Ng2#
2.Nd5#
1...Qg1 (Qg3, Qg5, Qg6, Qg7) 2.Nd5#
1...Qg2
2.Nxg2#
2.Nd5#
1...Qg4 2.Nd5#
1...Qa8 2.Ng2#
1...Qb8 (Qe8, Qf8)
2.Ng2#
2.Nd5#
1...Qc8
2.Ng2#
2.Nd5#
1...Qd8 2.Ng2#
1...Qe8
2.Ng2#
2.Nd5#
1...Qf8
2.Ng2#
2.Nd5#
1...Nf7 2.Nd5#
1...Ng6 2.Ng2#

Date added: 15/6/2021

641

(Hans Michael Erdenbrecher - Main-Post, 24 Nov 1967)

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1.Qh4! ~ 2.Rb5#
1...Kd6 2.Qe7#
1...Nxb4 2.Qd4#
1...Nf4 2.Qe7#
1...Qg4 2.Rxd5#
1...Qxh4 2.Rxd5#

Date added: 15/6/2021

642

(Paz Einat - The Problemist, Jul 2017)

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1.Nxd2! ~ 2.Qxc4#
1...Rxd4 2.Bg8#
1...Qxd2 2.Rxe5#

Date added: 15/6/2021

643

(Charles Promislo - Good Companion, 8th American Chess Problem Congress Ty 3rd HM, section Meredith, Aug 1921)

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1.Qc7!
1...Na4 (Nb6~) 2.Qc8#
1...Nb5 (Nd6~) 2.d5#
1...Nd7 2.Qc4#

Date added: 15/6/2021

644

(Henry Wald Bettmann - The Good Companion Chess Problem Club, Apr 1921)

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1.Qe3! ~ 2.c4#
1...Qxd4 2.Qxd4#
1...Qxg3+ 2.Kxg3#
1...Qf4+ 2.Kxf4#
1...Qxf6+ 2.Nxf6#
1...Qxe3+ 2.Kxe3#
1...Qe4+ 2.Qxe4#
1...Qf5+ 2.Rxf5#
1...Nb6 2.Nxc7#

Date added: 15/6/2021

645

(John Ormerod Scarlett Thursby - Chess Chips, 1878)

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1.d3! zz
1...Kxd4 2.Bb2#
1...cxd4 2.Ng4#
1...Rf5/Nf5 2.Nc6#
1...Re6 2.Rd5#
1...Rxd6 2.Re4#
1...Nxf3+ 2.Nxf3#

Date added: 15/6/2021

646

(Josef Kling - The Illustrated London News, 22 Aug 1846)

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1.Rb4!
1...Kxb4 2.Rd5#
1...Nd4+ 2.Rdxd4#
1...Qc6 (Qg8,Qg7) 2.Nd3#
1...Qd5 2.Rc6#
1...Qe4+ (Qg6+) 2.Rd3#
1...Ne4 (Nh7,Ng8,Ne8) 2.Nd3#
1...Be4+ 2.Rd3#

Date added: 18/6/2021

647

(Robert A. Lincoln - The Problemist, 1992)

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1.Qh2! (2.Qc7#)
1...Kd8 2.Qxb8#
1...Bg3 2.Qh8#
1...Bd8 2.Na7#

Date added: 20/6/2021

648

(Lajos Merenyi - Magyar Sakkvilág, Apr 1926)

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1.Kb6! Kd6 2.Qd4#

Date added: 20/6/2021