MESON Chess Problem Database
Problem Display
PID: 54250 (8/2p2p1Q/2P2P1N/3P2P1/3p2q1/3K1kPR/4N1p1/3B1bB1 w - - 0 1)
Walton, FW
Chess Life, 1956
#2
12 + 7
SOLUTION
- SOUND
- Sets
- 1...Qxh3
- 2.Qe4#
- 1...Qf5+
- 2.Qxf5#
- 1...Qh5
- 2.Qe4#
- 2.Qf5#
- 1...Qe6
- 2.g4#
- 1...Qd7
- 2.Qe4#
- 2.g4#
- 1...Qc8
- 2.Qe4#
- 2.g4#
- 1...Qxg3
- 2.Rxg3#
- 2.Qe4#
- 2.Qf5#
- 1...Qe4+
- 2.Qxe4#
- 1...Qf4
- 2.gxf4#
- 1...Qh4
- 2.gxh4#
- 1...Qxg5
- 2.Qe4#
- 2.g4#
- 1...Bxe2+
- 2.Bxe2#
- 1...Qxh3
- Tries
- 1.Kc2?
- threat
- 2.Sxd4#
- 2.Qd3#
- 1...Qf5+
- 2.Qxf5#
- 1...d3+
- 2.Qxd3#
- 1...Qxh3
- 2.Qd3#
- 1...Qxg3
- 2.Rxg3#
- 2.Qd3#
- 2.Qf5#
- 1...Qxg5
- 2.Sxd4#
- 2.g4#
- 1...Bxe2
- 2.Qd3#
- 1...Qe6
- 2.Sxd4#
- 2.g4#
- 1...Qf4
- 2.Sxd4#
- 2.gxf4#
- 1...Qe4+!
- threat
- 1.Kd2?
- threat
- 2.Sxd4#
- 2.Qd3#
- 1...Qf4+
- 2.gxf4#
- 1...Qxh3
- 2.Qd3#
- 1...Qxg3
- 2.Rxg3#
- 2.Qd3#
- 2.Qf5#
- 1...Bxe2
- 2.Bxe2#
- 2.Qd3#
- 1...Qf5
- 2.Qxf5#
- 1...Qe6
- 2.Sxd4#
- 2.g4#
- 1...Qe4
- 2.Sxd4#
- 2.g4#
- 1...d3
- 2.Sd4#
- 2.Qxd3#
- 1...Qxg5+!
- threat
- 1.Sxg4?
- threat
- 2.Sh2#
- 2.Se5#
- 2.Qe4#
- 2.Qf5#
- 1...Bxe2+
- 2.Bxe2#
- 1...Kxg4!
- threat
- 1.Bc2?
- 1...Qf5+
- 2.Qxf5#
- 1...Qe4+
- 2.Qxe4#
- 1...Qxh3
- 2.Qe4#
- 1...Qxg3
- 2.Rxg3#
- 2.Qe4#
- 2.Qf5#
- 1...Qxg5
- 2.Qe4#
- 2.g4#
- 1...Qh5
- 2.Qe4#
- 2.Qf5#
- 1...Qe6
- 2.g4#
- 1...Qd7
- 2.Qe4#
- 2.g4#
- 1...Qc8
- 2.Qe4#
- 2.g4#
- 1...Qf4
- 2.gxf4#
- 1...Qh4
- 2.gxh4#
- 1...Bxe2+!
- 1...Qf5+
- 1.Bb3?
- 1...Qf5+
- 2.Qxf5#
- 1...Qe4+
- 2.Qxe4#
- 1...Qxh3
- 2.Qe4#
- 1...Qxg3
- 2.Rxg3#
- 2.Qe4#
- 2.Qf5#
- 1...Qxg5
- 2.Qe4#
- 2.g4#
- 1...Qh5
- 2.Qe4#
- 2.Qf5#
- 1...Qe6
- 2.g4#
- 1...Qd7
- 2.Qe4#
- 2.g4#
- 1...Qc8
- 2.Qe4#
- 2.g4#
- 1...Qf4
- 2.gxf4#
- 1...Qh4
- 2.gxh4#
- 1...Bxe2+!
- 1...Qf5+
- 1.Ba4?
- 1...Qf5+
- 2.Qxf5#
- 1...Qe4+
- 2.Qxe4#
- 1...Qxh3
- 2.Qe4#
- 1...Qxg3
- 2.Rxg3#
- 2.Qe4#
- 2.Qf5#
- 1...Qxg5
- 2.Qe4#
- 2.g4#
- 1...Qh5
- 2.Qe4#
- 2.Qf5#
- 1...Qe6
- 2.g4#
- 1...Qd7
- 2.Qe4#
- 2.g4#
- 1...Qc8
- 2.Qe4#
- 2.g4#
- 1...Qf4
- 2.gxf4#
- 1...Qh4
- 2.gxh4#
- 1...Bxe2+!
- 1...Qf5+
- 1.Qf5+?
- 1...Qf4
- 2.Qxf4#
- 2.gxf4#
- 2.g4#
- 1...Qxf5+!
- 1...Qf4
- 1.Qg6?
- 1...Qf5+
- 2.Qxf5#
- 1...Qe4+
- 2.Qxe4#
- 1...Bxe2+
- 2.Bxe2#
- 1...Qxh3
- 2.Qe4#
- 1...Qxg3
- 2.Rxg3#
- 2.Qe4#
- 2.Qf5#
- 2.Qh5#
- 1...Qxg5
- 2.Qe4#
- 2.g4#
- 1...Qe6
- 2.g4#
- 1...Qh5
- 2.Qe4#
- 2.Qf5#
- 2.Qxh5#
- 1...Qd7
- 2.Qe4#
- 2.g4#
- 1...Qc8
- 2.Qe4#
- 2.g4#
- 1...Qf4
- 2.gxf4#
- 1...Qh4
- 2.gxh4#
- 1...fxg6!
- 1...Qf5+
- 1.d6?
- 1...Qf5+
- 2.Qxf5#
- 1...Qe4+
- 2.Qxe4#
- 1...Bxe2+
- 2.Bxe2#
- 1...Qxh3
- 2.Qe4#
- 1...Qxg3
- 2.Rxg3#
- 2.Qe4#
- 2.Qf5#
- 1...Qxg5
- 2.Qe4#
- 2.g4#
- 1...Qe6
- 2.g4#
- 1...Qh5
- 2.Qe4#
- 2.Qf5#
- 1...Qd7
- 2.Qe4#
- 2.g4#
- 1...Qc8
- 2.Qe4#
- 2.g4#
- 1...Qf4
- 2.gxf4#
- 1...Qh4
- 2.gxh4#
- 1...cxd6!
- 1...Qf5+
- 1.Kc2?
- Keys
- 1.Kc4!
- threat
- 2.Qd3#
- 1...d3+
- 2.Sd4#
- 1...Qxg5
- 2.g4#
- 1...Qf5
- 2.Qxf5#
- 1...Qe6
- 2.g4#
- 1...Qe4
- 2.g4#
- 1...Qf4
- 2.gxf4#
- threat
- 1.Kc4!
FEATURES
- Static
- TYPE = BLOCK_THREAT
- CHANGED MATES = 1
- ADDED MATES = 2
- REMOVED MATES = 3
- Sets
- Q(e);N_GUARD,XR(F)::QAB1(L)
- Q(e);CHECK,N_GUARD::QAR2(L),XQ(e)
- Q(e);OGATE::R(F)+P(E)
- Q(e);CHECK,N_GUARD::QAB1(L),XQ(e)
- Q(e);OGATE::R(F)+P(E),XQ(e)
- B(a);CHECK,OGATE,P_SPINB(a),XS(C)::B(A),XB(a)
- Tries
- Try
- K(D);N_SPINS(C),S_FLIGHT
- Threat
- DUALS(2)
- Vars
- Q(e);CHECK,N_GUARD::QAR2(L),XQ(e)
- P(d);CHECK::QAR2(L),XP(d)
- Q(e);XR(F)::QAR2(L)
- B(a);P_SPINB(a),XS(C)::QAR2(L)
- Refutation
- Q(e);CHECK
- Try
- K(D);N_SPINS(C),P-FLIGHT
- Threat
- DUALS(2)
- Vars
- Q(e);CHECK,OGATE::R(F)+P(E),XQ(e)
- Q(e);XR(F)::QAR2(L)
- Q(e);N_GUARD::QAR2(L),XQ(e)
- Refutation
- Q(e);CHECK,XP(H)
- Try
- S(K);XQ(e)
- Threat
- DUALS(4)
- Vars
- B(a);CHECK,OGATE,P_SPINB(a),XS(C)::B(A),XB(a)
- Refutation
- K(c);S_FLIGHT,XS(K)
- Try
- B(A);
- Vars
- Q(e);CHECK,N_GUARD::QAR2(L),XQ(e)
- Q(e);CHECK,N_GUARD::QAB1(L),XQ(e)
- Q(e);N_GUARD,XR(F)::QAB1(L)
- Q(e);OGATE::R(F)+P(E)
- Q(e);OGATE::R(F)+P(E),XQ(e)
- Refutation
- B(a);CHECK,XS(C)
- Try
- B(A);
- Vars
- Q(e);CHECK,N_GUARD::QAR2(L),XQ(e)
- Q(e);CHECK,N_GUARD::QAB1(L),XQ(e)
- Q(e);N_GUARD,XR(F)::QAB1(L)
- Q(e);OGATE::R(F)+P(E)
- Q(e);OGATE::R(F)+P(E),XQ(e)
- Refutation
- B(a);CHECK,XS(C)
- Try
- B(A);
- Vars
- Q(e);CHECK,N_GUARD::QAR2(L),XQ(e)
- Q(e);CHECK,N_GUARD::QAB1(L),XQ(e)
- Q(e);N_GUARD,XR(F)::QAB1(L)
- Q(e);OGATE::R(F)+P(E)
- Q(e);OGATE::R(F)+P(E),XQ(e)
- Refutation
- B(a);CHECK,XS(C)
- Try
- Q(L);CHECK
- Refutation
- Q(e);CHECK,XQ(L)
- Try
- Q(L);
- Vars
- Q(e);CHECK,N_GUARD::QAR2(L),XQ(e)
- Q(e);CHECK,N_GUARD::QAB1(L),XQ(e)
- B(a);CHECK,OGATE,P_SPINB(a),XS(C)::B(A),XB(a)
- Q(e);N_GUARD,XR(F)::QAB1(L)
- Q(e);OGATE::R(F)+P(E)
- Q(e);OGATE::R(F)+P(E),XQ(e)
- Refutation
- P(g);XQ(L)
- Try
- P(G);
- Vars
- Q(e);CHECK,N_GUARD::QAR2(L),XQ(e)
- Q(e);CHECK,N_GUARD::QAB1(L),XQ(e)
- B(a);CHECK,OGATE,P_SPINB(a),XS(C)::B(A),XB(a)
- Q(e);N_GUARD,XR(F)::QAB1(L)
- Q(e);OGATE::R(F)+P(E)
- Q(e);OGATE::R(F)+P(E),XQ(e)
- Refutation
- P(f);XP(G)
- Try
- Actual
- K(D);S_FLIGHT
- Threat
- QAR2(L)
- Vars
- P(d);CHECK,N_PINS(C)::B(A)+S(C),DCHECK
- Q(e);OGATE,XP(H)::R(F)+P(E)
- Q(e);N_GUARD::QAR2(L),XQ(e)
- Q(e);OGATE,P_PINP(G)::R(F)+P(E)
- Q(e);OGATE::R(F)+P(E)
- Q(e);OGATE::R(F)+P(E),XQ(e)
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).