MESON Chess Problem Database
Problem Display
PID: 204549 (kr5R/rq6/8/8/6Q1/8/6B1/R6K w - - 0 1)
Hertzendorf, A
Revista de Sah, 1925
#2
5 + 4
| 6490 | yacpdb | 2020 |
SOLUTION
- SOUND
- Sets
- 1...Qxg2+
- 2.Qxg2#
- 1...Qf3
- 2.Bxf3#
- 2.Qxf3#
- 1...Qe4
- 2.Bxe4#
- 2.Qxe4#
- 1...Qd5
- 2.Bxd5#
- 1...Qc6
- 2.Bxc6#
- 1...Ra2
- 2.Rxa2#
- 1...Ra3
- 2.Rxa3#
- 1...Ra4
- 2.Rxa4#
- 2.Qxa4#
- 1...Ra5
- 2.Rxa5#
- 1...Ra6
- 2.Rxa6#
- 1...Rc8
- 2.Rxc8#
- 2.Qxc8#
- 1...Rd8
- 2.Rxd8#
- 1...Re8
- 2.Rxe8#
- 1...Rf8
- 2.Rxf8#
- 1...Rg8
- 2.Rxg8#
- 2.Qxg8#
- 1...Qxg2+
- Tries
- 1.Ra4?
- 1...Qxg2+
- 2.Qxg2#
- 1...Rxa4
- 2.Qxa4#
- 1...Qf3
- 2.Bxf3#
- 2.Qxf3#
- 1...Qe4
- 2.Bxe4#
- 2.Qxe4#
- 1...Qd5
- 2.Bxd5#
- 1...Qc6
- 2.Bxc6#
- 1...Ra5
- 2.Rxa5#
- 1...Ra6
- 2.Rxa6#
- 1...Rc8
- 2.Rxc8#
- 2.Qxc8#
- 1...Rd8
- 2.Rxd8#
- 1...Re8
- 2.Rxe8#
- 1...Rf8
- 2.Rxf8#
- 1...Rg8
- 2.Rxg8#
- 2.Qxg8#
- 1...Rxh8+!
- 1...Qxg2+
- 1.Rc8?
- 1...Qxg2+
- 2.Qxg2#
- 1...Rxc8
- 2.Qxc8#
- 1...Qf3
- 2.Bxf3#
- 2.Qxf3#
- 1...Qe4
- 2.Bxe4#
- 2.Qxe4#
- 1...Qd5
- 2.Bxd5#
- 1...Qc6
- 2.Bxc6#
- 1...Ra2
- 2.Rxa2#
- 1...Ra3
- 2.Rxa3#
- 1...Ra4
- 2.Rxa4#
- 2.Qxa4#
- 1...Ra5
- 2.Rxa5#
- 1...Ra6
- 2.Rxa6#
- 1...Rxa1+!
- 1...Qxg2+
- 1.Rg8?
- 1...Qxg2+
- 2.Qxg2#
- 1...Rxg8
- 2.Qxg8#
- 1...Qf3
- 2.Bxf3#
- 2.Qxf3#
- 1...Qe4
- 2.Bxe4#
- 2.Qxe4#
- 1...Qd5
- 2.Bxd5#
- 1...Qc6
- 2.Bxc6#
- 1...Ra2
- 2.Rxa2#
- 1...Ra3
- 2.Rxa3#
- 1...Ra4
- 2.Rxa4#
- 2.Qxa4#
- 1...Ra5
- 2.Rxa5#
- 1...Ra6
- 2.Rxa6#
- 1...Rc8
- 2.Rxc8#
- 2.Qxc8#
- 1...Rd8
- 2.Rxd8#
- 1...Re8
- 2.Rxe8#
- 1...Rf8
- 2.Rxf8#
- 1...Rxa1+!
- 1...Qxg2+
- 1.Qh3?
- 1...Qxg2+
- 2.Qxg2#
- 1...Rxh8
- 2.Qxh8#
- 1...Qf3
- 2.Bxf3#
- 2.Qxf3#
- 1...Qe4
- 2.Bxe4#
- 1...Qd5
- 2.Bxd5#
- 1...Qc6
- 2.Bxc6#
- 1...Ra2
- 2.Rxa2#
- 1...Ra3
- 2.Rxa3#
- 2.Qxa3#
- 1...Ra4
- 2.Rxa4#
- 1...Ra5
- 2.Rxa5#
- 1...Ra6
- 2.Rxa6#
- 1...Rc8
- 2.Rxc8#
- 2.Qxc8#
- 1...Rd8
- 2.Rxd8#
- 1...Re8
- 2.Rxe8#
- 1...Rf8
- 2.Rxf8#
- 1...Rg8
- 2.Rxg8#
- 1...Rxa1+!
- 1...Qxg2+
- 1.Qd4?
- threat
- 2.Rxa7#
- 2.Qxa7#
- 1...Rxa1+
- 2.Qxa1#
- 1...Rxh8+
- 2.Qxh8#
- 1...Rc8
- 2.Rxc8#
- 2.Qxa7#
- 1...Rd8
- 2.Rxd8#
- 2.Qxa7#
- 2.Qxd8#
- 1...Re8
- 2.Rxe8#
- 2.Qxa7#
- 1...Rf8
- 2.Rxf8#
- 2.Qxa7#
- 1...Rg8
- 2.Rxg8#
- 2.Qxa7#
- 1...Ra2
- 2.Rxa2#
- 1...Ra3
- 2.Rxa3#
- 1...Ra4
- 2.Rxa4#
- 2.Qxa4#
- 1...Ra5
- 2.Rxa5#
- 1...Ra6
- 2.Rxa6#
- 1...Qxg2+!
- threat
- 1.Qg8?
- threat
- 2.Qxb8#
- 1...Qxg2+
- 2.Qxg2#
- 1...Rxg8
- 2.Rxg8#
- 1...Rc8
- 2.Qxc8#
- 1...Rd8
- 2.Qxd8#
- 1...Re8
- 2.Qxe8#
- 1...Rf8
- 2.Qxf8#
- 1...Rxa1+!
- threat
- 1.Ra4?
- Keys
- 1.Qg7!
- threat
- 2.Bxb7#
- 2.Qxb7#
- 1...Qxg2+
- 2.Qxg2#
- 1...Rxa1+
- 2.Qxa1#
- 1...Rxh8+
- 2.Qxh8#
- 1...Ra2
- 2.Rxa2#
- 2.Qxb7#
- 1...Ra3
- 2.Rxa3#
- 2.Qxb7#
- 1...Ra4
- 2.Rxa4#
- 2.Qxb7#
- 1...Ra5
- 2.Rxa5#
- 2.Qxb7#
- 1...Ra6
- 2.Rxa6#
- 2.Qxb7#
- 1...Rc8
- 2.Rxc8#
- 2.Qxb7#
- 1...Rd8
- 2.Rxd8#
- 2.Qxb7#
- 1...Re8
- 2.Rxe8#
- 2.Qxb7#
- 1...Rf8
- 2.Rxf8#
- 2.Qxf8#
- 2.Qxb7#
- 1...Rg8
- 2.Rxg8#
- 2.Qxb7#
- 2.Qxg8#
- 1...Qf3
- 2.Bxf3#
- 2.Rxa7#
- 2.Qxa7#
- 1...Qe4
- 2.Bxe4#
- 2.Rxa7#
- 2.Qxa7#
- 1...Qd5
- 2.Bxd5#
- 2.Rxa7#
- 2.Qxa7#
- 1...Qc6
- 2.Bxc6#
- 2.Rxa7#
- 2.Qxa7#
- threat
- 1.Qg7!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 9
- Sets
- Q(b);CHECK,N_SPINQ(b),OGATE,XB(C)::QAB(D),XQ(b)
- Q(b);::B(C),XQ(b)
- R(a);OGATEB::R(A),XR(a)
- R(d);OGATEB::R(E),XR(d)
- Tries
- Try
- R(A);
- Vars
- Q(b);CHECK,N_SPINQ(b),OGATE,XB(C)::QAB(D),XQ(b)
- R(a);N_SPINR(a),OGATE,P_SPINR(d),XR(A)::QAR(D),XR(a)
- Q(b);::B(C),XQ(b)
- R(a);OGATEB::R(A),XR(a)
- R(d);OGATEB::R(E),XR(d)
- Refutation
- R(d);CHECK,XR(E)
- Try
- R(E);
- Vars
- Q(b);CHECK,N_SPINQ(b),OGATE,XB(C)::QAB(D),XQ(b)
- R(d);OGATE,XR(E)::QAR2(D),XR(d)
- Q(b);::B(C),XQ(b)
- R(a);OGATEB::R(A),XR(a)
- Refutation
- R(a);CHECK,N_SPINR(a),P_SPINR(d),XR(A)
- Try
- R(E);
- Vars
- Q(b);CHECK,N_SPINQ(b),OGATE,XB(C)::QAB(D),XQ(b)
- R(d);OGATE,XR(E)::QAR(D),XR(d)
- Q(b);::B(C),XQ(b)
- R(a);OGATEB::R(A),XR(a)
- R(d);OGATEB::R(E),XR(d)
- Refutation
- R(a);CHECK,N_SPINR(a),P_SPINR(d),XR(A)
- Try
- Q(D);
- Vars
- Q(b);CHECK,N_SPINQ(b),OGATE,XB(C)::QAB(D),XQ(b)
- R(d);OGATE,P_PINQ(D),XR(E)::QAB1(D),XR(d)
- Q(b);::B(C),XQ(b)
- R(a);OGATEB::R(A),XR(a)
- R(d);OGATEB::R(E),XR(d)
- Refutation
- R(a);CHECK,N_SPINR(a),P_SPINR(d),XR(A)
- Try
- Q(D);
- Threat
- DUALS(2)
- Vars
- R(a);CHECK,N_SPINR(a),OGATE,P_SPINR(d),XR(A)::QAB(D),XR(a)
- R(d);CHECK,OGATE,XR(E)::QAB1(D),XR(d)
- R(a);OGATEB::R(A),XR(a)
- Refutation
- Q(b);CHECK,N_SPINQ(b),XB(C)
- Try
- Q(D);
- Threat
- QAR1(D),XR(d)
- Vars
- Q(b);CHECK,N_SPINQ(b),OGATE,XB(C)::QAB(D),XQ(b)
- R(d);OGATE,XQ(D)::R(E),XR(d)
- R(d);OGATEB::QAR2(D),XR(d)
- R(d);OGATEB::QAR(D),XR(d)
- Refutation
- R(a);CHECK,N_SPINR(a),P_SPINR(d),XR(A)
- Try
- Actual
- Q(D);
- Threat
- DUALS(2)
- Vars
- Q(b);CHECK,N_SPINQ(b),OGATE,XB(C)::QAB(D),XQ(b)
- R(a);CHECK,N_SPINR(a),OGATE,P_SPINR(d),XR(A)::QAB(D),XR(a)
- R(d);CHECK,OGATE,XR(E)::QAB1(D),XR(d)
Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
CSS/Javascript (jQuery, Bootstrap & DataTables).