MESON Chess Problem Database
Problem Display
PID: 6758 (3Rq3/B6B/2N1Q3/3P4/K3N2r/1Ppk1P2/R7/8 w - - 0 1)
Gray, Robert
4th Prize, Il Problema, 1933
#2
11 + 4
SOLUTION
- SOUND
- Sets
- 1...Qh5
- 2.Sb4#
- 1...Qxc6+
- 2.dxc6#
- 1...Qg6
- 2.Sb4#
- 2.Se5#
- 1...Qf7
- 2.Sb4#
- 2.Se5#
- 1...Qxe6
- 2.Sb4#
- 2.dxe6#
- 1...Qe7
- 2.Se5#
- 1...Qxd8
- 2.Sb4#
- 2.Se5#
- 1...Qf8
- 2.Se5#
- 1...Qg8
- 2.Sb4#
- 2.Se5#
- 1...Qh8
- 2.Sb4#
- 1...Rh1
- 2.Sf2#
- 2.Sc5#
- 1...Rh2
- 2.Sf2#
- 2.Sc5#
- 1...Rh3
- 2.Sf2#
- 2.Sc5#
- 1...Rxe4+
- 2.Bxe4#
- 1...Rh5
- 2.Sf2#
- 2.Sc5#
- 1...Rh6
- 2.Sf2#
- 2.Sc5#
- 1...Rxh7
- 2.Sf2#
- 2.Sc5#
- 1...Qh5
- Tries
- 1.Ka3?
- threat
- 2.Sf2#
- 2.Sc5#
- 2.Sb4#
- 2.Se5#
- 1...Qe7+
- 2.Sc5#
- 1...Qf8+
- 2.Sc5#
- 1...Qxc6
- 2.Sf2#
- 2.dxc6#
- 1...Qxe6
- 2.Sf2#
- 2.Sb4#
- 2.dxe6#
- 1...Rxe4
- 2.Sb4#
- 2.Se5#
- 2.Bxe4#
- 1...Qh5
- 2.Sf2#
- 2.Sc5#
- 2.Sb4#
- 1...Qh8
- 2.Sf2#
- 2.Sc5#
- 2.Sb4#
- 1...Rh5
- 2.Sf2#
- 2.Sc5#
- 2.Sb4#
- 1...c2!
- threat
- 1.Kb5?
- threat
- 2.Sf2#
- 2.Sc5#
- 1...Qxc6+
- 2.dxc6#
- 1...Qxe6
- 2.Sf2#
- 2.Sb4#
- 2.dxe6#
- 1...Rxe4
- 2.Bxe4#
- 1...c2!
- threat
- 1.Rxe8?
- threat
- 2.Sb4#
- 2.Se5#
- 1...Rxe4+
- 2.Sb4#
- 2.Bxe4#
- 2.Qxe4#
- 1...Rh5
- 2.Sf2#
- 2.Sc5#
- 2.Sb4#
- 1...c2!
- threat
- 1.Qc8?
- threat
- 2.Qa6#
- 1...Qxc6+
- 2.dxc6#
- 1...Qxe4+
- 2.Sb4#
- 1...Rxe4+!
- threat
- 1.Qe5?
- threat
- 2.Qxc3#
- 2.Qd4#
- 1...Qxc6+
- 2.dxc6#
- 1...Rxe4+
- 2.Bxe4#
- 2.Qd4#
- 1...Qxe5
- 2.Sb4#
- 2.Sxe5#
- 1...Qh8
- 2.Sb4#
- 1...c2!
- threat
- 1.Qf6?
- threat
- 2.Qxc3#
- 2.Qd4#
- 1...Qxc6+
- 2.dxc6#
- 1...Qxe4+
- 2.Sb4#
- 2.Qd4#
- 1...Rxe4+
- 2.Qd4#
- 1...Qe5
- 2.Sb4#
- 2.Sxe5#
- 1...Qh8
- 2.Sb4#
- 2.Se5#
- 1...c2!
- threat
- 1.Qxe8?
- threat
- 2.Sb4#
- 2.Se5#
- 1...Rxe4+
- 2.Sb4#
- 2.Bxe4#
- 2.Qxe4#
- 1...Rh5
- 2.Sf2#
- 2.Sc5#
- 2.Sb4#
- 1...c2!
- threat
- 1.d6?
- threat
- 2.Qc4#
- 2.Qd5#
- 1...Rxe4+
- 2.Bxe4#
- 2.Qc4#
- 1...Qxe6
- 2.Sb4#
- 1...c2
- 2.Qc4#
- 1...Qh5
- 2.Sb4#
- 2.Qc4#
- 1...Qf7
- 2.Sb4#
- 2.Se5#
- 1...Qg8
- 2.Sb4#
- 2.Se5#
- 1...Qh8
- 2.Sb4#
- 2.Qc4#
- 1...Rh5
- 2.Sf2#
- 2.Sc5#
- 2.Qc4#
- 1...Qxc6+!
- threat
- 1.Ka3?
- Keys
- 1.Qh3!
- threat
- 2.Qf1#
- 1...Qxc6+
- 2.dxc6#
- 1...Qxe4+
- 2.Sb4#
- 1...Rxe4+
- 2.fxe4#
- 1...Rxh3
- 2.Sf2#
- threat
- 1.Qh3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 2
- REMOVED MATES = 4
- Sets
- Q(d);::S(G)
- Q(d);CHECK,OGATE,XS(G)::R(K)+P(F),XQ(d)
- R(c);CHECK,OGATE,P_PINS(G),P_SPINR(c),XS(E)::B(J),XR(c)
- Tries
- Try
- K(D);N_SPINS(E),P-FLIGHT
- Threat
- DUALS(4)
- Vars
- Q(d);CHECK::B(J)+S(E),DCHECK
- Refutation
- P(a);
- Try
- K(D);N_SPINS(E),P_SPINS(G),S_FLIGHT
- Threat
- DUALS(2)
- Vars
- Q(d);CHECK,OGATE,XS(G)::R(K)+P(F),XQ(d)
- R(c);OGATE,P_SPINR(c),XS(E)::B(J),XR(c)
- Refutation
- P(a);
- Try
- R(K);XQ(d)
- Threat
- DUALS(2)
- Refutation
- P(a);
- Try
- Q(H);
- Threat
- QAB(H)
- Vars
- Q(d);CHECK,OGATE,XS(G)::R(K)+P(F),XQ(d)
- Q(d);CHECK,P_SPINQ(d),XS(E)::S(G)
- Refutation
- R(c);CHECK,P_PINS(G),P_SPINR(c),XS(E)
- Try
- Q(H);
- Threat
- DUALS(2)
- Vars
- Q(d);CHECK,OGATE,XS(G)::R(K)+P(F),XQ(d)
- Q(d);::S(G)
- Refutation
- P(a);
- Try
- Q(H);
- Threat
- DUALS(2)
- Vars
- Q(d);CHECK,OGATE,XS(G)::R(K)+P(F),XQ(d)
- R(c);CHECK,P_PINS(G),P_SPINR(c),XS(E)::QAR1(H)
- Refutation
- P(a);
- Try
- Q(H);XQ(d)
- Threat
- DUALS(2)
- Refutation
- P(a);
- Try
- P(F);
- Threat
- DUALS(2)
- Vars
- Q(d);XQ(H)::S(G)
- P(a);::QAB1(H)
- Refutation
- Q(d);CHECK,XS(G)
- Try
- Actual
- Q(H);
- Threat
- QAB(H)
- Vars
- Q(d);CHECK,OGATE,XS(G)::R(K)+P(F),XQ(d)
- Q(d);CHECK,P_SPINQ(d),XS(E)::S(G)
- R(c);CHECK,OGATE,P_PINS(G),P_SPINR(c),XS(E)::QAR(H)+P(C),XR(c)
- R(c);N_PINS(E),P_PINS(G),XQ(H)::B(J)+S(E),DCHECK
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).