MESON Chess Problem Database
Problem Display
PID: 195843 (Q3b3/5Rp1/2r1P2k/4rPN1/P4N2/6R1/KBB2P2/8 w - - 0 1)
Stewart, John
The Observer, 1942
(First published on Sun Jul 5 1942)
#2
12 + 5
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Re1
- 2.Bxg7#
- 1...Re2
- 2.Bxg7#
- 1...Re3
- 2.Bxg7#
- 1...Re4
- 2.Bxg7#
- 1...Ra5
- 2.Bxg7#
- 1...Rb5
- 2.Bxg7#
- 1...Rec5
- 2.Bxg7#
- 1...Rd5
- 2.Bxg7#
- 1...Rxf5
- 2.Bxg7#
- 1...Rexe6
- 2.Bxg7#
- 1...Rxc2
- 2.Qh1#
- 1...Rc3
- 2.Qh1#
- 1...Rc4
- 2.Qh1#
- 1...Rcc5
- 2.Qh1#
- 1...Ra6
- 2.Qh1#
- 1...Rb6
- 2.Qh1#
- 1...Rd6
- 2.Qh1#
- 1...Rcxe6
- 2.Qh1#
- 1...Rc7
- 2.Qh1#
- 1...Rc8
- 2.Qh1#
- 1...Bd7
- 2.Qh8#
- 1...Bxf7
- 2.Qh8#
- 1...g6
- 2.Rh7#
- 1...Re1
- Tries
- 1.Ka1?
- 1...Rxf5
- 2.Bxg7#
- 1...Rexe6
- 2.Bxg7#
- 1...Rxc2
- 2.Qh1#
- 1...Rcxe6
- 2.Qh1#
- 1...Bxf7
- 2.Qh8#
- 1...Re2
- 2.Bxg7#
- 1...Re3
- 2.Bxg7#
- 1...Re4
- 2.Bxg7#
- 1...Ra5
- 2.Bxg7#
- 1...Rb5
- 2.Bxg7#
- 1...Rec5
- 2.Bxg7#
- 1...Rd5
- 2.Bxg7#
- 1...Rc3
- 2.Qh1#
- 1...Rc4
- 2.Qh1#
- 1...Rcc5
- 2.Qh1#
- 1...Ra6
- 2.Qh1#
- 1...Rb6
- 2.Qh1#
- 1...Rd6
- 2.Qh1#
- 1...Rc7
- 2.Qh1#
- 1...Rc8
- 2.Qh1#
- 1...Bd7
- 2.Qh8#
- 1...g6
- 2.Rh7#
- 1...Re1+!
- 1...Rxf5
- 1.Ba1?
- 1...Rxf5
- 2.Bxg7#
- 1...Rexe6
- 2.Bxg7#
- 1...Rcxe6
- 2.Qh1#
- 1...Bxf7
- 2.Qh8#
- 1...Re1
- 2.Bxg7#
- 1...Re2
- 2.Bxg7#
- 1...Re3
- 2.Bxg7#
- 1...Re4
- 2.Bxg7#
- 1...Ra5
- 2.Bxg7#
- 1...Rb5
- 2.Bxg7#
- 1...Rec5
- 2.Bxg7#
- 1...Rd5
- 2.Bxg7#
- 1...Rc3
- 2.Qh1#
- 1...Rc4
- 2.Qh1#
- 1...Rcc5
- 2.Qh1#
- 1...Ra6
- 2.Qh1#
- 1...Rb6
- 2.Qh1#
- 1...Rd6
- 2.Qh1#
- 1...Rc7
- 2.Qh1#
- 1...Rc8
- 2.Qh1#
- 1...Bd7
- 2.Qh8#
- 1...g6
- 2.Rh7#
- 1...Rxc2+!
- 1...Rxf5
- 1.Bd4?
- 1...Rxf5
- 2.Bxg7#
- 1...Rexe6
- 2.Bxg7#
- 1...Rcxe6
- 2.Qh1#
- 1...Bxf7
- 2.Qh8#
- 1...Re1
- 2.Bxg7#
- 1...Re2
- 2.Bxg7#
- 1...Re3
- 2.Bxg7#
- 1...Re4
- 2.Bxg7#
- 1...Ra5
- 2.Bxg7#
- 1...Rb5
- 2.Bxg7#
- 1...Rec5
- 2.Bxg7#
- 1...Rd5
- 2.Bxg7#
- 1...Rc3
- 2.Qh1#
- 1...Rc4
- 2.Qh1#
- 1...Rcc5
- 2.Qh1#
- 1...Ra6
- 2.Qh1#
- 1...Rb6
- 2.Qh1#
- 1...Rd6
- 2.Qh1#
- 1...Rc7
- 2.Qh1#
- 1...Rc8
- 2.Qh1#
- 1...Bd7
- 2.Qh8#
- 1...g6
- 2.Rh7#
- 1...Rxc2+!
- 1...Rxf5
- 1.Bxe5?
- threat
- 2.Bxg7#
- 1...Bxf7
- 2.Qh8#
- 1...g6
- 2.Bg7#
- 2.Rh7#
- 1...Rxc2+!
- threat
- 1.Bd1?
- 1...Rxf5
- 2.Bxg7#
- 1...Rexe6
- 2.Bxg7#
- 1...Rcxe6
- 2.Qh1#
- 1...Bxf7
- 2.Qh8#
- 1...Re1
- 2.Bxg7#
- 1...Re3
- 2.Bxg7#
- 1...Re4
- 2.Bxg7#
- 1...Ra5
- 2.Bxg7#
- 1...Rb5
- 2.Bxg7#
- 1...Rec5
- 2.Bxg7#
- 1...Rd5
- 2.Bxg7#
- 1...Rc1
- 2.Qh1#
- 1...Rc2
- 2.Qh1#
- 1...Rc3
- 2.Qh1#
- 1...Rc4
- 2.Qh1#
- 1...Rcc5
- 2.Qh1#
- 1...Ra6
- 2.Qh1#
- 1...Rb6
- 2.Qh1#
- 1...Rd6
- 2.Qh1#
- 1...Rc7
- 2.Qh1#
- 1...Rc8
- 2.Qh1#
- 1...Bd7
- 2.Qh8#
- 1...g6
- 2.Rh7#
- 1...Re2!
- 1...Rxf5
- 1.Rg1?
- 1...Rxf5
- 2.Bxg7#
- 1...Rexe6
- 2.Bxg7#
- 1...Rxc2
- 2.Qh1#
- 1...Rcxe6
- 2.Qh1#
- 1...Bxf7
- 2.Qh8#
- 1...Re2
- 2.Bxg7#
- 1...Re1
- 2.Bxg7#
- 1...Re3
- 2.Bxg7#
- 1...Re4
- 2.Bxg7#
- 1...Ra5
- 2.Bxg7#
- 1...Rb5
- 2.Bxg7#
- 1...Rec5
- 2.Bxg7#
- 1...Rd5
- 2.Bxg7#
- 1...Rc4
- 2.Qh1#
- 1...Rcc5
- 2.Qh1#
- 1...Ra6
- 2.Qh1#
- 1...Rb6
- 2.Qh1#
- 1...Rd6
- 2.Qh1#
- 1...Rc7
- 2.Qh1#
- 1...Rc8
- 2.Qh1#
- 1...Bd7
- 2.Qh8#
- 1...g6
- 2.Rh7#
- 1...Rc3!
- 1...Rxf5
- 1.Rg4?
- 1...Rxf5
- 2.Bxg7#
- 1...Rexe6
- 2.Bxg7#
- 1...Rxc2
- 2.Qh1#
- 1...Rcxe6
- 2.Qh1#
- 1...Bxf7
- 2.Qh8#
- 1...Re2
- 2.Bxg7#
- 1...Re1
- 2.Bxg7#
- 1...Re3
- 2.Bxg7#
- 1...Re4
- 2.Bxg7#
- 1...Ra5
- 2.Bxg7#
- 1...Rb5
- 2.Bxg7#
- 1...Rec5
- 2.Bxg7#
- 1...Rd5
- 2.Bxg7#
- 1...Rc4
- 2.Qh1#
- 1...Rcc5
- 2.Qh1#
- 1...Ra6
- 2.Qh1#
- 1...Rb6
- 2.Qh1#
- 1...Rd6
- 2.Qh1#
- 1...Rc7
- 2.Qh1#
- 1...Rc8
- 2.Qh1#
- 1...Bd7
- 2.Qh8#
- 1...g6
- 2.Rh7#
- 1...Rc3!
- 1...Rxf5
- 1.Qd8?
- threat
- 2.Rh3#
- 1...Bxf7
- 2.Qh8#
- 1...Re3
- 2.Bxg7#
- 1...Rc3!
- threat
- 1.a5?
- 1...Rxf5
- 2.Bxg7#
- 1...Rexe6
- 2.Bxg7#
- 1...Rxc2
- 2.Qh1#
- 1...Rcxe6
- 2.Qh1#
- 1...Bxf7
- 2.Qh8#
- 1...Re2
- 2.Bxg7#
- 1...Re1
- 2.Bxg7#
- 1...Re3
- 2.Bxg7#
- 1...Re4
- 2.Bxg7#
- 1...Rb5
- 2.Bxg7#
- 1...Rec5
- 2.Bxg7#
- 1...Rd5
- 2.Bxg7#
- 1...Rc3
- 2.Qh1#
- 1...Rc4
- 2.Qh1#
- 1...Rcc5
- 2.Qh1#
- 1...Ra6
- 2.Qh1#
- 1...Rb6
- 2.Qh1#
- 1...Rd6
- 2.Qh1#
- 1...Rc7
- 2.Qh1#
- 1...Rc8
- 2.Qh1#
- 1...Bd7
- 2.Qh8#
- 1...g6
- 2.Rh7#
- 1...Rxa5+!
- 1...Rxf5
- 1.e7?
- 1...Rxf5
- 2.Bxg7#
- 1...Rxe7
- 2.Bxg7#
- 1...Rxc2
- 2.Qh1#
- 1...Re2
- 2.Bxg7#
- 1...Re1
- 2.Bxg7#
- 1...Re3
- 2.Bxg7#
- 1...Re4
- 2.Bxg7#
- 1...Ra5
- 2.Bxg7#
- 1...Rb5
- 2.Bxg7#
- 1...Rec5
- 2.Bxg7#
- 1...Rd5
- 2.Bxg7#
- 1...Ree6
- 2.Bxg7#
- 1...Rc3
- 2.Qh1#
- 1...Rc4
- 2.Qh1#
- 1...Rcc5
- 2.Qh1#
- 1...Ra6
- 2.Qh1#
- 1...Rb6
- 2.Qh1#
- 1...Rd6
- 2.Qh1#
- 1...Rce6
- 2.Qh1#
- 1...Rf6
- 2.Qh1#
- 1...Rg6
- 2.Qh1#
- 1...Rc7
- 2.Qh1#
- 1...Rc8
- 2.Qh1#
- 1...Bd7
- 2.Qh8#
- 1...g6
- 2.Rh7#
- 1...Bxf7+!
- 1...Rxf5
- 1.Ka1?
- Keys
- 1.Bc3!
- 1...Rxf5
- 2.Bxg7#
- 1...Rexe6
- 2.Bxg7#
- 1...Rxc3
- 2.Qh1#
- 1...Rcxe6
- 2.Qh1#
- 1...Bxf7
- 2.Qh8#
- 1...Re1
- 2.Bxg7#
- 1...Re2
- 2.Bxg7#
- 1...Re3
- 2.Bxg7#
- 1...Re4
- 2.Bxg7#
- 1...Ra5
- 2.Bxg7#
- 1...Rb5
- 2.Bxg7#
- 1...Rec5
- 2.Bxg7#
- 1...Rd5
- 2.Bxg7#
- 1...Rc4
- 2.Qh1#
- 1...Rcc5
- 2.Qh1#
- 1...Ra6
- 2.Qh1#
- 1...Rb6
- 2.Qh1#
- 1...Rd6
- 2.Qh1#
- 1...Rc7
- 2.Qh1#
- 1...Rc8
- 2.Qh1#
- 1...Bd7
- 2.Qh8#
- 1...g6
- 2.Rh7#
- 1...Rxf5
- 1.Bc3!
FEATURES
- Static
- TYPE = WAITER
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 1
- Sets
- R(a);OGATE::B(B),XP(d)
- R(a);OGATE,P_PINP(F)::B(B),XP(d)
- R(a);OGATE,XP(H)::B(B),XP(d)
- R(a);OGATE,XP(J)::B(B),XP(d)
- R(b);OGATE,P_PINB(B),XB(C)::QAR(L)
- R(b);OGATE::QAR(L)
- R(b);OGATE,P_PINP(F),SBLOCK::QAR(L)
- R(b);OGATE,XP(J)::QAR(L)
- B(e);OGATE::QAR2(L)
- B(e);OGATE,P_PINP(J),XR(K)::QAR2(L)
- P(d);OGATE::R1(K)
- Tries
- Try
- K(A);P-FLIGHT
- Vars
- R(a);OGATE,XP(H)::B(B),XP(d)
- R(a);OGATE,XP(J)::B(B),XP(d)
- R(b);OGATE,XB(C)::QAR(L)
- R(b);OGATE,XP(J)::QAR(L)
- B(e);OGATE,XR(K)::QAR2(L)
- R(a);OGATE::B(B),XP(d)
- R(a);OGATE,P_PINP(F)::B(B),XP(d)
- R(b);OGATE::QAR(L)
- R(b);OGATE,P_PINP(F),SBLOCK::QAR(L)
- B(e);OGATE::QAR2(L)
- P(d);OGATE::R1(K)
- Refutation
- R(a);CHECK
- Try
- B(B);
- Vars
- R(a);OGATE,XP(H)::B(B),XP(d)
- R(a);OGATE,XP(J)::B(B),XP(d)
- R(b);OGATE,XP(J)::QAR(L)
- B(e);OGATE,P_PINP(J),XR(K)::QAR2(L)
- R(a);OGATE::B(B),XP(d)
- R(a);OGATE,P_PINB(C)::B(B),XP(d)
- R(a);OGATE,P_PINP(F)::B(B),XP(d)
- R(b);OGATE::QAR(L)
- R(b);OGATE,P_PINP(F),SBLOCK::QAR(L)
- B(e);OGATE::QAR2(L)
- P(d);OGATE::R1(K)
- Refutation
- R(b);CHECK,XB(C)
- Try
- B(B);
- Vars
- R(a);OGATE,XP(H)::B(B),XP(d)
- R(a);OGATE,XP(J)::B(B),XP(d)
- R(b);OGATE,XP(J)::QAR(L)
- B(e);OGATE,P_PINP(J),XR(K)::QAR2(L)
- R(a);OGATE::B(B),XP(d)
- R(a);OGATE,P_PINB(C)::B(B),XP(d)
- R(a);OGATE,P_PINP(F)::B(B),XP(d)
- R(b);OGATE::QAR(L)
- R(b);OGATE,P_PINP(F),SBLOCK::QAR(L)
- B(e);OGATE::QAR2(L)
- P(d);OGATE::R1(K)
- Refutation
- R(b);CHECK,XB(C)
- Try
- B(B);XR(a)
- Threat
- B(B),XP(d)
- Vars
- B(e);OGATE,P_PINP(J),XR(K)::QAR2(L)
- Refutation
- R(b);CHECK,XB(C)
- Try
- B(C);
- Vars
- R(a);OGATE,XP(H)::B(B),XP(d)
- R(a);OGATE,XP(J)::B(B),XP(d)
- R(b);OGATE,XP(J)::QAR(L)
- B(e);OGATE,P_PINP(J),XR(K)::QAR2(L)
- R(a);OGATE::B(B),XP(d)
- R(a);OGATE,P_PINP(F)::B(B),XP(d)
- R(b);OGATE::QAR(L)
- R(b);OGATE,P_PINB(B)::QAR(L)
- R(b);OGATE,P_PINP(F),SBLOCK::QAR(L)
- B(e);OGATE::QAR2(L)
- P(d);OGATE::R1(K)
- Refutation
- R(a);P_PINB(B)
- Try
- R(E);
- Vars
- R(a);OGATE,XP(H)::B(B),XP(d)
- R(a);OGATE,XP(J)::B(B),XP(d)
- R(b);OGATE,P_PINB(B),XB(C)::QAR(L)
- R(b);OGATE,XP(J)::QAR(L)
- B(e);OGATE,P_PINP(J),XR(K)::QAR2(L)
- R(a);OGATE::B(B),XP(d)
- R(a);OGATE,P_PINP(F)::B(B),XP(d)
- R(b);OGATE::QAR(L)
- R(b);OGATE,P_PINP(F),SBLOCK::QAR(L)
- B(e);OGATE::QAR2(L)
- P(d);OGATE::R1(K)
- Refutation
- R(b);
- Try
- R(E);
- Vars
- R(a);OGATE,XP(H)::B(B),XP(d)
- R(a);OGATE,XP(J)::B(B),XP(d)
- R(b);OGATE,P_PINB(B),XB(C)::QAR(L)
- R(b);OGATE,XP(J)::QAR(L)
- B(e);OGATE,P_PINP(J),XR(K)::QAR2(L)
- R(a);OGATE::B(B),XP(d)
- R(a);OGATE,P_PINP(F)::B(B),XP(d)
- R(b);OGATE::QAR(L)
- R(b);OGATE,P_PINP(F),SBLOCK::QAR(L)
- B(e);OGATE::QAR2(L)
- P(d);OGATE::R1(K)
- Refutation
- R(b);
- Try
- Q(L);
- Threat
- R(E)
- Vars
- B(e);OGATE,P_PINP(J),XR(K)::QAR2(L)
- R(a);OGATE::B(B),XP(d)
- Refutation
- R(b);
- Try
- P(F);
- Vars
- R(a);OGATE,XP(H)::B(B),XP(d)
- R(a);OGATE,XP(J)::B(B),XP(d)
- R(b);OGATE,P_PINB(B),XB(C)::QAR(L)
- R(b);OGATE,XP(J)::QAR(L)
- B(e);OGATE,P_PINP(J),XR(K)::QAR2(L)
- R(a);OGATE::B(B),XP(d)
- R(b);OGATE::QAR(L)
- R(b);OGATE,P_PINP(F),SBLOCK::QAR(L)
- B(e);OGATE::QAR2(L)
- P(d);OGATE::R1(K)
- Refutation
- R(a);CHECK,XP(F)
- Try
- P(J);
- Vars
- R(a);OGATE,XP(H)::B(B),XP(d)
- R(a);OGATE,XP(J)::B(B),XP(d)
- R(b);OGATE,P_PINB(B),XB(C)::QAR(L)
- R(a);OGATE::B(B),XP(d)
- R(a);OGATE,P_PINP(F)::B(B),XP(d)
- R(b);OGATE::QAR(L)
- R(b);OGATE,P_PINP(F),SBLOCK::QAR(L)
- B(e);OGATE::QAR2(L)
- P(d);OGATE::R1(K)
- Refutation
- B(e);CHECK,XR(K)
- Try
- Actual
- B(B);
- Vars
- R(a);OGATE,XP(H)::B(B),XP(d)
- R(a);OGATE,XP(J)::B(B),XP(d)
- R(b);OGATE,XB(B)::QAR(L)
- R(b);OGATE,XP(J)::QAR(L)
- B(e);OGATE,P_PINP(J),XR(K)::QAR2(L)
- R(a);OGATE::B(B),XP(d)
- R(a);OGATE,P_PINB(C)::B(B),XP(d)
- R(a);OGATE,P_PINP(F)::B(B),XP(d)
- R(b);OGATE::QAR(L)
- R(b);OGATE,P_PINP(F),SBLOCK::QAR(L)
- B(e);OGATE::QAR2(L)
- P(d);OGATE::R1(K)
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).