MESON Chess Problem Database
Problem Display
PID: 69968 (1n3rB1/1R3P2/2n2RN1/r2k1pp1/N2p2p1/PK1PP1P1/2P5/Q1b5 w - - 0 1)
Lewis, Robert Tony
3rd Prize, Chess, 1950
#2
13 + 10
| 81 | Chess | 1951 |
SOLUTION
- SOUND
- Sets
- 1...Rxa4
- 2.Rb5#
- 1...Rb5+
- 2.Rxb5#
- 1...Rc5
- 2.Sb6#
- 1...Ra6
- 2.Rb5#
- 1...Ra7
- 2.Rb5#
- 1...Ra8
- 2.Rb5#
- 1...Rxf7
- 2.Bxf7#
- 1...Rc8
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Rd8
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Re8
- 2.fxe8Q#
- 2.fxe8S#
- 2.fxe8B#
- 2.fxe8R#
- 1...Rxg8
- 2.fxg8Q#
- 2.fxg8B#
- 1...Bb2
- 2.Qh1#
- 1...Bd2
- 2.Qh1#
- 1...Bxa3
- 2.Qh1#
- 1...Bxe3
- 2.Qh1#
- 1...Sb4
- 2.Qxd4#
- 1...Se5
- 2.Se7#
- 2.Qxd4#
- 1...Sa7
- 2.Qxd4#
- 1...Se7
- 2.Qxd4#
- 1...Sd8
- 2.Qxd4#
- 1...Sa6
- 2.Rd7#
- 1...Sd7
- 2.Rxd7#
- 1...dxe3
- 2.c4#
- 1...f4
- 2.e4#
- 1...Rxa4
- Tries
- 1.Ka2?
- 1...Rxa4
- 2.Rb5#
- 1...Rxf7
- 2.Bxf7#
- 1...Rxg8
- 2.fxg8Q#
- 2.fxg8B#
- 1...Bxa3
- 2.Qh1#
- 1...Bxe3
- 2.Qh1#
- 1...dxe3
- 2.c4#
- 1...Rb5
- 2.Rxb5#
- 1...Rc5
- 2.Sb6#
- 1...Ra6
- 2.Rb5#
- 1...Ra7
- 2.Rb5#
- 1...Ra8
- 2.Rb5#
- 1...Rc8
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Rd8
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Re8
- 2.fxe8Q#
- 2.fxe8S#
- 2.fxe8B#
- 2.fxe8R#
- 1...Bb2
- 2.Qh1#
- 1...Bd2
- 2.Qh1#
- 1...Se5
- 2.Se7#
- 2.Qxd4#
- 1...Sa7
- 2.Qxd4#
- 1...Se7
- 2.Qxd4#
- 1...Sd8
- 2.Qxd4#
- 1...Sa6
- 2.Rd7#
- 1...Sd7
- 2.Rxd7#
- 1...f4
- 2.e4#
- 1...Sb4+!
- 1...Rxa4
- 1.Sf4+?
- 1...Ke5
- 2.Re6#
- 1...gxf4!
- 1...Ke5
- 1.Se7+?
- 1...Sxe7
- 2.Qxd4#
- 1...Ke5!
- 1...Sxe7
- 1.Rxb8?
- 1...Rb5+
- 2.Rxb5#
- 1...Rxa4
- 2.Rb5#
- 1...Rxf7
- 2.Bxf7#
- 1...Rxg8
- 2.fxg8Q#
- 2.fxg8B#
- 1...Bxa3
- 2.Qh1#
- 1...Bxe3
- 2.Qh1#
- 1...Sxb8
- 2.Qxd4#
- 1...dxe3
- 2.c4#
- 1...Rc5
- 2.Sb6#
- 1...Ra6
- 2.Rb5#
- 1...Ra7
- 2.Rb5#
- 1...Ra8
- 2.Rb5#
- 1...Rc8
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Rd8
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Re8
- 2.fxe8Q#
- 2.fxe8S#
- 2.fxe8B#
- 2.fxe8R#
- 1...Bb2
- 2.Qh1#
- 1...Bd2
- 2.Qh1#
- 1...Sb4
- 2.Qxd4#
- 1...Se5
- 2.Se7#
- 2.Qxd4#
- 1...Sa7
- 2.Qxd4#
- 1...Se7
- 2.Qxd4#
- 1...Sd8
- 2.Qxd4#
- 1...f4
- 2.e4#
- 1...Rxb8+!
- 1...Rb5+
- 1.Qc3?
- threat
- 2.Sb6#
- 2.Qc4#
- 1...Rb5+
- 2.Rxb5#
- 1...Rxa4
- 2.Rb5#
- 1...Rc5
- 2.Sb6#
- 2.Qxc5#
- 1...Ra6
- 2.Rb5#
- 2.Qc4#
- 2.Qc5#
- 1...Se5
- 2.Sb6#
- 2.Se7#
- 2.Qxd4#
- 2.Qxa5#
- 1...Sd7
- 2.Rxd7#
- 2.Qc4#
- 2.Qxc6#
- 1...dxc3!
- threat
- 1.Qxc1?
- threat
- 2.Qh1#
- 1...Rb5+
- 2.Rxb5#
- 1...Rxa4
- 2.Rb5#
- 1...Re8
- 2.fxe8Q#
- 2.fxe8S#
- 2.fxe8B#
- 2.fxe8R#
- 1...Se5
- 2.Se7#
- 1...f4
- 2.e4#
- 1...dxe3!
- threat
- 1.c3?
- threat
- 2.c4#
- 1...Rb5+
- 2.Rxb5#
- 1...Rxa4
- 2.Rb5#
- 1...Rc5
- 2.Sb6#
- 1...Se5
- 2.Se7#
- 1...dxc3!
- threat
- 1.Ka2?
- Keys
- 1.Qa2!
- 1...Rb5+
- 2.Rxb5#
- 1...Rxa4
- 2.Rb5#
- 1...Rxf7
- 2.Bxf7#
- 1...Rxg8
- 2.fxg8Q#
- 2.fxg8B#
- 1...Bxa3
- 2.Kxa3#
- 1...Bxe3
- 2.Kb2#
- 1...dxe3
- 2.Kc3#
- 1...Sa6
- 2.Rd7#
- 1...Rc5
- 2.Sb6#
- 1...Ra6
- 2.Rb5#
- 1...Ra7
- 2.Rb5#
- 1...Ra8
- 2.Rb5#
- 1...Rc8
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Rd8
- 2.f8Q#
- 2.f8S#
- 2.f8B#
- 2.f8R#
- 1...Re8
- 2.fxe8Q#
- 2.fxe8S#
- 2.fxe8B#
- 2.fxe8R#
- 1...Bb2
- 2.Kxb2#
- 1...Bd2
- 2.Kb2#
- 1...Sb4
- 2.Kxb4#
- 1...Se5
- 2.Se7#
- 1...Sa7
- 2.Kb4#
- 1...Se7
- 2.Kb4#
- 1...Sd8
- 2.Kb4#
- 1...Sd7
- 2.Rxd7#
- 1...f4
- 2.e4#
- 1...Rb5+
- 1.Qa2!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 9
- ADDED MATES = 1
- REMOVED MATES = 0
- Sets
- R(d);N_GUARD,XS(H)::R(K)
- R(d);CHECK,N_GUARD::R(K),XR(d)
- R(d);SBLOCK::S(H)
- R(d);N_GUARD::R(K)
- R(j);OGATE,P_SPINR(j),XP(L)::B(M),XR(j)
- R(j);OGATE,XB(M)::PXR(j)=Q
- B(a);OGATE::QAB(A)
- B(a);OGATE,XP(C)::QAB(A)
- B(a);OGATE,XP(F)::QAB(A)
- S(h);N_GUARD::QAR1(A),XP(b)
- S(i);N_GUARD::R(K)
- S(i);N_GUARD::R(K),XS(i)
- P(b);N_GUARD,XP(F)::P(B)
- P(f);N_GUARD::P(F)
- Tries
- Try
- K(D);S_FLIGHT
- Vars
- R(d);N_GUARD,P_PINP(C),XS(H)::R(K)
- R(j);OGATE,P_SPINR(j),XP(L)::B(M),XR(j)
- R(j);OGATE,XB(M)::PXR(j)=Q
- B(a);OGATE,XP(C)::QAB(A)
- B(a);OGATE,XP(F)::QAB(A)
- P(b);N_GUARD,XP(F)::P(B)
- R(d);N_GUARD::R(K),XR(d)
- R(d);SBLOCK::S(H)
- R(d);N_GUARD::R(K)
- B(a);OGATE::QAB(A)
- S(h);N_GUARD::QAR1(A),XP(b)
- S(i);N_GUARD::R(K)
- S(i);N_GUARD::R(K),XS(i)
- P(f);N_GUARD::P(F)
- Refutation
- S(h);CHECK
- Try
- S(J);CHECK
- Vars
- K(e);P-FLIGHT,P_SPINP(b)::R1(I)
- Refutation
- P(g);XS(J)
- Try
- S(J);CHECK
- Vars
- S(h);XS(J)::QAR1(A),XP(b)
- Refutation
- K(e);P-FLIGHT,P_SPINP(b)
- Try
- R(K);XS(i)
- Vars
- R(d);CHECK,N_GUARD::R(K),XR(d)
- R(d);N_GUARD,XS(H)::R(K)
- R(j);OGATE,P_SPINR(j),XP(L)::B(M),XR(j)
- R(j);OGATE,XB(M)::PXR(j)=Q
- B(a);OGATE,XP(C)::QAB(A)
- B(a);OGATE,XP(F)::QAB(A)
- S(h);N_GUARD,XR(K)::QAR1(A),XP(b)
- P(b);N_GUARD,XP(F)::P(B)
- R(d);SBLOCK::S(H)
- R(d);N_GUARD::R(K)
- B(a);OGATE::QAB(A)
- S(h);N_GUARD::QAR1(A),XP(b)
- P(f);N_GUARD::P(F)
- Refutation
- R(j);CHECK,XR(K)
- Try
- Q(A);
- Threat
- DUALS(2)
- Vars
- R(d);CHECK,N_GUARD::R(K),XR(d)
- R(d);N_GUARD,XS(H)::R(K)
- Refutation
- P(b);XQ(A)
- Try
- Q(A);XB(a)
- Threat
- QAB(A)
- Vars
- R(d);CHECK,N_GUARD::R(K),XR(d)
- R(d);N_GUARD,XS(H)::R(K)
- S(h);N_GUARD,SBLOCK::S(J)
- P(f);N_GUARD::P(F)
- Refutation
- P(b);XP(F)
- Try
- P(B);
- Threat
- P(B)
- Vars
- R(d);CHECK,N_GUARD::R(K),XR(d)
- R(d);N_GUARD,XS(H)::R(K)
- R(d);SBLOCK::S(H)
- S(h);N_GUARD,SBLOCK::S(J)
- Refutation
- P(b);XP(B)
- Try
- Actual
- Q(A);
- Vars
- R(d);CHECK,N_GUARD::R(K),XR(d)
- R(d);N_GUARD,XS(H)::R(K)
- R(j);OGATE,P_SPINR(j),XP(L)::B(M),XR(j)
- R(j);OGATE,XB(M)::PXR(j)=Q
- B(a);XP(C)::QAB(A)+K(D),XB(a)
- B(a);XP(F)::QAB(A)+K(D)
- P(b);XP(F)::QAB(A)+K(D)
- S(i);N_GUARD::R(K)
- R(d);SBLOCK::S(H)
- R(d);N_GUARD::R(K)
- B(a);::QAB(A)+K(D),XB(a)
- B(a);::QAB(A)+K(D)
- S(h);::QAB(A)+K(D),XS(h)
- S(h);N_GUARD,SBLOCK::S(J)
- S(h);::QAB(A)+K(D)
- S(i);N_GUARD::R(K),XS(i)
- P(f);N_GUARD::P(F)
Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
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