MESON Chess Problem Database
Problem Display
PID: 124346 (5KBr/2QpB2p/R3bN1k/7P/3p2RP/3Pb1N1/8/8 w - - 0 1)
McGregor, John NO
Toronto Globe, 1881
#2
11 + 7
| 6490 | yacpdb | 2009 |
SOLUTION
- SOUND
- Sets
- 1...Rxg8+
- 2.Sxg8#
- 1...Bc1
- 2.Qxc1#
- 1...Bg1
- 2.Qf4#
- 1...Bf2
- 2.Qf4#
- 1...Bf4
- 2.Qxf4#
- 1...Bg5
- 2.hxg5#
- 1...Ba2
- 2.Sf5#
- 1...Bb3
- 2.Sf5#
- 1...Bc4
- 2.Sf5#
- 1...Bxg4
- 2.Sxg4#
- 1...Bd5
- 2.Sf5#
- 1...Bf5
- 2.Sxf5#
- 1...Bf7
- 2.Sf5#
- 1...Bxg8
- 2.Sf5#
- 2.Sxg8#
- 1...Rxg8+
- Tries
- 1.Ke8?
- threat
- 2.Bf8#
- 1...Rxg8+
- 2.Sxg8#
- 1...Bf7+!
- threat
- 1.Sxd7?
- threat
- 2.Rxe6#
- 1...Bg5
- 2.Bxg5#
- 2.hxg5#
- 1...Rxg8+!
- threat
- 1.Sxh7?
- threat
- 2.Rg6#
- 1...Bg5
- 2.Bxg5#
- 2.hxg5#
- 1...Rxg8+!
- threat
- 1.Ba3?
- 1...Rxg8+
- 2.Sxg8#
- 1...Bxg4
- 2.Sxg4#
- 1...Bxg8
- 2.Sf5#
- 2.Sxg8#
- 1...Bc1
- 2.Bxc1#
- 2.Qxc1#
- 1...Bg1
- 2.Qf4#
- 1...Bf2
- 2.Qf4#
- 1...Bf4
- 2.Qxf4#
- 1...Bg5
- 2.hxg5#
- 1...Ba2
- 2.Sf5#
- 1...Bb3
- 2.Sf5#
- 1...Bc4
- 2.Sf5#
- 1...Bd5
- 2.Sf5#
- 1...Bf5
- 2.Sxf5#
- 1...Bf7
- 2.Sf5#
- 1...d5
- 2.Qg7#
- 1...d6
- 2.Qg7#
- 1...Bd2!
- 1...Rxg8+
- 1.Bd8?
- 1...Rxg8+
- 2.Sxg8#
- 1...Bxg4
- 2.Sxg4#
- 1...Bxg8
- 2.Sf5#
- 2.Sxg8#
- 1...Bc1
- 2.Qxc1#
- 1...Bg1
- 2.Qf4#
- 1...Bf2
- 2.Qf4#
- 1...Bf4
- 2.Qxf4#
- 1...Bg5
- 2.hxg5#
- 1...Ba2
- 2.Sf5#
- 1...Bb3
- 2.Sf5#
- 1...Bc4
- 2.Sf5#
- 1...Bd5
- 2.Sf5#
- 1...Bf5
- 2.Sxf5#
- 1...Bf7
- 2.Sf5#
- 1...d5
- 2.Qg7#
- 1...d6
- 2.Qg7#
- 1...Bd2!
- 1...Rxg8+
- 1.Rxd4?
- threat
- 2.Sg4#
- 1...Rxg8+
- 2.Sxg8#
- 1...Bg4
- 2.Sxg4#
- 1...d6!
- threat
- 1.Re4?
- threat
- 2.Sg4#
- 1...Rxg8+
- 2.Sxg8#
- 1...Bg4
- 2.Sxg4#
- 1...d6!
- threat
- 1.Rf4?
- threat
- 2.Sg4#
- 1...Rxg8+
- 2.Sxg8#
- 1...Bg4
- 2.Sxg4#
- 1...d6!
- threat
- 1.Rg5?
- threat
- 2.Sg4#
- 1...Rxg8+
- 2.Sxg8#
- 1...Bg4
- 2.Sxg4#
- 1...d6!
- threat
- 1.Rg7?
- threat
- 2.Sg4#
- 1...Rxg8+
- 2.Sxg8#
- 1...Bg4
- 2.Sxg4#
- 1...d6!
- threat
- 1.Rxe6?
- threat
- 2.Sf5#
- 2.Sxd7#
- 1...Rxg8+
- 2.Sxg8#
- 1...Bg5
- 2.Sf5#
- 2.hxg5#
- 1...d5
- 2.Sf5#
- 2.Sfe4#
- 2.Sxd5#
- 2.Sd7#
- 2.Sxh7#
- 2.Se8#
- 1...d6
- 2.Sf5#
- 2.Sfe4#
- 2.Sd5#
- 2.Sd7#
- 2.Sxh7#
- 2.Se8#
- 1...dxe6!
- threat
- 1.Ke8?
- Keys
- 1.Bb4!
- 1...Rxg8+
- 2.Sxg8#
- 1...Bxg4
- 2.Sxg4#
- 1...Bxg8
- 2.Sf5#
- 2.Sxg8#
- 1...Bd2
- 2.Bxd2#
- 1...Bc1
- 2.Qxc1#
- 1...Bg1
- 2.Qf4#
- 1...Bf2
- 2.Qf4#
- 1...Bf4
- 2.Qxf4#
- 1...Bg5
- 2.hxg5#
- 1...Ba2
- 2.Sf5#
- 1...Bb3
- 2.Sf5#
- 1...Bc4
- 2.Sf5#
- 1...Bd5
- 2.Sf5#
- 1...Bf5
- 2.Sxf5#
- 1...Bf7
- 2.Sf5#
- 1...d5
- 2.Qg7#
- 1...d6
- 2.Qg7#
- 1...Rxg8+
- 1.Bb4!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 0
- Sets
- R(g);CHECK,XB(K)::S(G),XR(g)
- B(a);OGATEB::QAB(H),XB(a)
- B(a);N_GUARD::QAB(H)
- B(a);N_GUARD::QAB(H),XB(a)
- B(a);OGATE::P(D),XB(a)
- B(c);N_GUARD::S(B)
- B(c);XR(C)::R(F)+S(G),DCHECK,XB(c)
- B(c);N_GUARD::S(B),XB(c)
- Tries
- Try
- K(J);P-FLIGHT
- Threat
- B(I)
- Vars
- R(g);CHECK,XB(K)::S(G),XR(g)
- Refutation
- B(c);CHECK
- Try
- S(G);P_PINB(c),XP(e)
- Threat
- R(F),XB(c)
- Refutation
- R(g);CHECK,XB(K)
- Try
- S(G);P_PINB(c),XP(f)
- Threat
- R1(C)
- Refutation
- R(g);CHECK,XB(K)
- Try
- B(I);
- Vars
- R(g);CHECK,XB(K)::S(G),XR(g)
- B(c);XR(C)::R(F)+S(G),DCHECK,XB(c)
- B(a);N_GUARD::QAB(H)
- B(a);N_GUARD::QAB(H),XB(a)
- B(a);OGATE::P(D),XB(a)
- B(c);N_GUARD::S(B)
- B(c);N_GUARD::S(B),XB(c)
- P(e);OGATE::QAB1(H)
- Refutation
- B(a);
- Try
- B(I);
- Vars
- R(g);CHECK,XB(K)::S(G),XR(g)
- B(c);XR(C)::R(F)+S(G),DCHECK,XB(c)
- B(a);OGATEB::QAB(H),XB(a)
- B(a);N_GUARD::QAB(H)
- B(a);N_GUARD::QAB(H),XB(a)
- B(a);OGATE::P(D),XB(a)
- B(c);N_GUARD::S(B)
- B(c);N_GUARD::S(B),XB(c)
- P(e);OGATE::QAB1(H)
- Refutation
- B(a);
- Try
- R(C);XP(b)
- Threat
- S(G)
- Vars
- R(g);CHECK,XB(K)::S(G),XR(g)
- B(c);::R(F)+S(G),DCHECK,XB(c)
- Refutation
- P(e);
- Try
- R(C);
- Threat
- S(G)
- Vars
- R(g);CHECK,XB(K)::S(G),XR(g)
- B(c);::R(F)+S(G),DCHECK,XB(c)
- Refutation
- P(e);
- Try
- R(C);
- Threat
- S(G)
- Vars
- R(g);CHECK,XB(K)::S(G),XR(g)
- B(c);::R(F)+S(G),DCHECK,XB(c)
- Refutation
- P(e);
- Try
- R(C);
- Threat
- S(G)
- Vars
- R(g);CHECK,XB(K)::S(G),XR(g)
- B(c);::R(F)+S(G),DCHECK,XB(c)
- Refutation
- P(e);
- Try
- R(C);
- Threat
- S(G)
- Vars
- R(g);CHECK,XB(K)::S(G),XR(g)
- B(c);::R(F)+S(G),DCHECK,XB(c)
- Refutation
- P(e);
- Try
- R(F);XB(c)
- Threat
- DUALS(2)
- Vars
- R(g);CHECK,XB(K)::R(F)+S(G),DCHECK,XR(g)
- Refutation
- P(e);XR(F)
- Try
- Actual
- B(I);
- Vars
- R(g);CHECK,XB(K)::S(G),XR(g)
- B(c);XR(C)::R(F)+S(G),DCHECK,XB(c)
- B(a);OGATEB::B(I),XB(a)
- B(a);OGATEB::QAB(H),XB(a)
- B(a);N_GUARD::QAB(H)
- B(a);N_GUARD::QAB(H),XB(a)
- B(a);OGATE::P(D),XB(a)
- B(c);N_GUARD::S(B)
- B(c);N_GUARD::S(B),XB(c)
- P(e);OGATE::QAB1(H)
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).