MESON Chess Problem Database
Problem Display
PID: 397 (4RK2/p1R5/P2Bb3/1r1k1p2/2NpqP2/8/8/Q6B w - - 0 1)
Warton, Joseph John
Warton, Thomas Joseph
The Observer, 1941
(First published on Sun Jul 27 1941)
#2
9 + 7
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Qxh1
- 2.Qxh1#
- 1...Qg2
- 2.Bxg2#
- 1...Qf3
- 2.Bxf3#
- 1...Rb1
- 2.Rc5#
- 1...Rb2
- 2.Rc5#
- 1...Rb3
- 2.Rc5#
- 1...Rb4
- 2.Rc5#
- 1...Ra5
- 2.Qxa5#
- 1...Rc5
- 2.Rxc5#
- 1...Rb6
- 2.Rc5#
- 1...Rb7
- 2.Rc5#
- 1...Rb8
- 2.Rc5#
- 1...Bd7
- 2.Re5#
- 1...Bf7
- 2.Re5#
- 1...Bc8
- 2.Re5#
- 1...Bg8
- 2.Re5#
- 1...d3
- 2.Qe5#
- 1...Qxh1
- Tries
- 1.Kg7?
- 1...Qg2+
- 2.Bxg2#
- 1...Qxh1
- 2.Qxh1#
- 1...Qf3
- 2.Bxf3#
- 1...Rc5
- 2.Rxc5#
- 1...Rb1
- 2.Rc5#
- 1...Rb2
- 2.Rc5#
- 1...Rb3
- 2.Rc5#
- 1...Rb4
- 2.Rc5#
- 1...Ra5
- 2.Qxa5#
- 1...Rb6
- 2.Rc5#
- 1...Rb8
- 2.Rc5#
- 1...Bd7
- 2.Re5#
- 1...Bf7
- 2.Re5#
- 1...Bc8
- 2.Re5#
- 1...Bg8
- 2.Re5#
- 1...d3
- 2.Qe5#
- 1...Rb7!
- 1...Qg2+
- 1.Se3+?
- 1...dxe3
- 2.Qe5#
- 2.Qd1#
- 1...Kxd6!
- 1...dxe3
- 1.Bg2?
- 1...Qf3
- 2.Bxf3#
- 1...Rc5
- 2.Rxc5#
- 1...Rb1
- 2.Rc5#
- 1...Rb2
- 2.Rc5#
- 1...Rb3
- 2.Rc5#
- 1...Rb4
- 2.Rc5#
- 1...Ra5
- 2.Qxa5#
- 1...Rb6
- 2.Rc5#
- 1...Rb7
- 2.Rc5#
- 1...Rb8
- 2.Rc5#
- 1...Bd7
- 2.Re5#
- 1...Bf7
- 2.Re5#
- 1...Bc8
- 2.Re5#
- 1...Bg8
- 2.Re5#
- 1...d3
- 2.Qe5#
- 1...Qxg2!
- 1...Qf3
- 1.Bf3?
- 1...Rc5
- 2.Rxc5#
- 1...Rb1
- 2.Rc5#
- 1...Rb2
- 2.Rc5#
- 1...Rb3
- 2.Rc5#
- 1...Rb4
- 2.Rc5#
- 1...Ra5
- 2.Qxa5#
- 1...Rb6
- 2.Rc5#
- 1...Rb7
- 2.Rc5#
- 1...Rb8
- 2.Rc5#
- 1...Bd7
- 2.Re5#
- 1...Bf7
- 2.Re5#
- 1...Bc8
- 2.Re5#
- 1...Bg8
- 2.Re5#
- 1...d3
- 2.Qe5#
- 1...Qxf3!
- 1...Rc5
- 1.Bb4?
- 1...Qxh1
- 2.Qxh1#
- 1...Qg2
- 2.Bxg2#
- 1...Qf3
- 2.Bxf3#
- 1...Rc5
- 2.Rxc5#
- 1...Ra5
- 2.Qxa5#
- 1...Rb6
- 2.Rc5#
- 1...Rb7
- 2.Rc5#
- 1...Rb8
- 2.Rc5#
- 1...Bd7
- 2.Re5#
- 1...Bf7
- 2.Re5#
- 1...Bc8
- 2.Re5#
- 1...Bg8
- 2.Re5#
- 1...d3
- 2.Se3#
- 2.Qe5#
- 1...Rxb4!
- 1...Qxh1
- 1.Be5?
- threat
- 2.Qxd4#
- 1...d3
- 2.Se3#
- 2.Qd4#
- 1...Rb2!
- threat
- 1.Rcc8?
- 1...Qxh1
- 2.Qxh1#
- 1...Qg2
- 2.Bxg2#
- 1...Qf3
- 2.Bxf3#
- 1...Rc5
- 2.Rxc5#
- 1...Ra5
- 2.Qxa5#
- 1...Rb1
- 2.Rc5#
- 1...Rb2
- 2.Rc5#
- 1...Rb3
- 2.Rc5#
- 1...Rb4
- 2.Rc5#
- 1...Rb6
- 2.Rc5#
- 1...Rb7
- 2.Rc5#
- 1...Rb8
- 2.Rc5#
- 1...Bd7
- 2.Re5#
- 1...Bf7
- 2.Re5#
- 1...Bg8
- 2.Re5#
- 1...d3
- 2.Qe5#
- 1...Bxc8!
- 1...Qxh1
- 1.Ree7?
- 1...Qxh1
- 2.Qxh1#
- 1...Qg2
- 2.Bxg2#
- 1...Qf3
- 2.Bxf3#
- 1...Rc5
- 2.Rxc5#
- 1...Ra5
- 2.Qxa5#
- 1...Rb1
- 2.Rc5#
- 1...Rb2
- 2.Rc5#
- 1...Rb3
- 2.Rc5#
- 1...Rb4
- 2.Rc5#
- 1...Rb6
- 2.Rc5#
- 1...Rb7
- 2.Rc5#
- 1...Bd7
- 2.Re5#
- 1...Bf7
- 2.Re5#
- 1...Bc8
- 2.Re5#
- 1...Bg8
- 2.Re5#
- 1...d3
- 2.Qe5#
- 1...Rb8+!
- 1...Qxh1
- 1.Qb2?
- threat
- 2.Qxb5#
- 1...Rxb2
- 2.Rc5#
- 1...Qg2
- 2.Bxg2#
- 2.Qxg2#
- 1...Qf3
- 2.Bxf3#
- 1...Rc5
- 2.Rxc5#
- 1...Ra5
- 2.Qb7#
- 1...Rb3
- 2.Rc5#
- 1...Rb4
- 2.Rc5#
- 1...Rb6
- 2.Rc5#
- 1...Rb7
- 2.Rc5#
- 2.Qxb7#
- 1...Rb8
- 2.Rc5#
- 1...Bd7
- 2.Re5#
- 1...d3
- 2.Qe5#
- 1...Qxh1!
- threat
- 1.Qd1?
- 1...Qxh1
- 2.Qxh1#
- 1...Qg2
- 2.Bxg2#
- 1...Qf3
- 2.Bxf3#
- 2.Qxf3#
- 1...Rc5
- 2.Rxc5#
- 1...d3
- 2.Qxd3#
- 1...Rb1
- 2.Rc5#
- 1...Rb2
- 2.Rc5#
- 1...Rb3
- 2.Rc5#
- 1...Rb4
- 2.Rc5#
- 1...Rb6
- 2.Rc5#
- 1...Rb7
- 2.Rc5#
- 1...Rb8
- 2.Rc5#
- 1...Bd7
- 2.Re5#
- 1...Bf7
- 2.Re5#
- 1...Bc8
- 2.Re5#
- 1...Bg8
- 2.Re5#
- 1...Ra5!
- 1...Qxh1
- 1.Qe1?
- 1...Qxh1
- 2.Qxh1#
- 2.Qe5#
- 2.Qxe6#
- 1...Rc5
- 2.Rxc5#
- 1...Ra5
- 2.Qxa5#
- 1...Qg2
- 2.Bxg2#
- 2.Qe5#
- 2.Qxe6#
- 1...Qf3
- 2.Bxf3#
- 2.Qe5#
- 2.Qxe6#
- 1...Rb1
- 2.Rc5#
- 1...Rb2
- 2.Rc5#
- 1...Rb3
- 2.Rc5#
- 1...Rb4
- 2.Rc5#
- 1...Rb6
- 2.Rc5#
- 1...Rb7
- 2.Rc5#
- 1...Rb8
- 2.Rc5#
- 1...Bd7
- 2.Re5#
- 1...Bf7
- 2.Re5#
- 1...Bc8
- 2.Re5#
- 1...Bg8
- 2.Re5#
- 1...d3!
- 1...Qxh1
- 1.Qf1?
- 1...Qxh1
- 2.Qxh1#
- 1...Qg2
- 2.Bxg2#
- 2.Qxg2#
- 1...Qf3
- 2.Bxf3#
- 2.Qxf3#
- 1...d3
- 2.Qxd3#
- 1...Rb1
- 2.Rc5#
- 1...Rb2
- 2.Rc5#
- 1...Rb3
- 2.Rc5#
- 1...Rb4
- 2.Rc5#
- 1...Rc5
- 2.Rxc5#
- 1...Rb6
- 2.Rc5#
- 1...Rb7
- 2.Rc5#
- 1...Rb8
- 2.Rc5#
- 1...Bd7
- 2.Re5#
- 1...Bf7
- 2.Re5#
- 1...Bc8
- 2.Re5#
- 1...Bg8
- 2.Re5#
- 1...Ra5!
- 1...Qxh1
- 1.Qa3?
- 1...Qg2
- 2.Bxg2#
- 1...Qf3
- 2.Bxf3#
- 2.Qxf3#
- 1...Rc5
- 2.Rxc5#
- 2.Qxc5#
- 1...d3
- 2.Qxd3#
- 1...Ra5
- 2.Qxa5#
- 1...Rb1
- 2.Rc5#
- 2.Qc5#
- 1...Rb2
- 2.Rc5#
- 2.Qc5#
- 1...Rb3
- 2.Rc5#
- 2.Qc5#
- 1...Rb4
- 2.Rc5#
- 1...Rb6
- 2.Rc5#
- 2.Qc5#
- 1...Rb7
- 2.Rc5#
- 2.Qc5#
- 1...Rb8
- 2.Rc5#
- 2.Qc5#
- 1...Bd7
- 2.Re5#
- 1...Bf7
- 2.Re5#
- 1...Bc8
- 2.Re5#
- 1...Bg8
- 2.Re5#
- 1...Qxh1!
- 1...Qg2
- 1.Kg7?
- Keys
- 1.Qb1!
- threat
- 2.Qxb5#
- 1...Qxh1
- 2.Qxh1#
- 1...Rxb1
- 2.Rc5#
- 1...Rc5
- 2.Rxc5#
- 1...d3
- 2.Qxd3#
- 1...Ra5
- 2.Qb7#
- 1...Qg2
- 2.Bxg2#
- 1...Qf3
- 2.Bxf3#
- 1...Rb2
- 2.Rc5#
- 1...Rb3
- 2.Rc5#
- 1...Rb4
- 2.Rc5#
- 1...Rb6
- 2.Rc5#
- 1...Rb7
- 2.Rc5#
- 2.Qxb7#
- 1...Rb8
- 2.Rc5#
- 1...Bd7
- 2.Re5#
- threat
- 1.Qb1!
FEATURES
- Static
- TYPE = BLOCK_THREAT
- CHANGED MATES = 2
- ADDED MATES = 0
- REMOVED MATES = 4
- Sets
- Q(b);N_SPINQ(b),OGATE,XB(B)::QAB(A),XQ(b)
- Q(b);OGATEB::B(B),XQ(b)
- R(c);N_GUARD::R1(G)
- R(c);OGATEB::QAR(A),XR(c)
- R(c);N_GUARD::R1(G),XR(c)
- R(c);N_GUARD,P_PINR(H)::R1(G)
- B(f);OGATE::R1(H)
- P(a);OGATE::QAR1(A)
- Tries
- Try
- K(I);S_FLIGHT
- Vars
- Q(b);CHECK,OGATEB::B(B),XQ(b)
- Q(b);N_SPINQ(b),OGATE,XB(B)::QAB(A),XQ(b)
- Q(b);OGATEB::B(B),XQ(b)
- R(c);N_GUARD::R1(G),XR(c)
- R(c);N_GUARD::R1(G)
- R(c);OGATEB::QAR(A),XR(c)
- B(f);OGATE::R1(H)
- P(a);OGATE::QAR1(A)
- Refutation
- R(c);P_PINR(G)
- Try
- S(C);CHECK
- Refutation
- K(d);N_SPINQ(b),P-FLIGHT,XB(F)
- Try
- B(B);
- Vars
- Q(b);OGATEB::B(B),XQ(b)
- R(c);N_GUARD::R1(G),XR(c)
- R(c);N_GUARD::R1(G)
- R(c);OGATEB::QAR(A),XR(c)
- R(c);N_GUARD,P_PINR(H)::R1(G)
- B(f);OGATE::R1(H)
- P(a);OGATE::QAR1(A)
- Refutation
- Q(b);N_SPINQ(b),XB(B)
- Try
- B(B);
- Vars
- R(c);N_GUARD::R1(G),XR(c)
- R(c);N_GUARD::R1(G)
- R(c);OGATEB::QAR(A),XR(c)
- R(c);N_GUARD,P_PINR(H)::R1(G)
- B(f);OGATE::R1(H)
- P(a);OGATE::QAR1(A)
- Refutation
- Q(b);N_SPINQ(b),XB(B)
- Try
- B(F);
- Vars
- Q(b);N_SPINQ(b),OGATE,XB(B)::QAB(A),XQ(b)
- Q(b);OGATEB::B(B),XQ(b)
- R(c);N_GUARD::R1(G),XR(c)
- R(c);OGATEB::QAR(A),XR(c)
- R(c);N_GUARD::R1(G)
- R(c);N_GUARD,P_PINR(H)::R1(G)
- B(f);OGATE::R1(H)
- Refutation
- R(c);XB(F)
- Try
- B(F);
- Threat
- QAR1(A),XP(a)
- Refutation
- R(c);
- Try
- R(G);
- Vars
- Q(b);N_SPINQ(b),OGATE,XB(B)::QAB(A),XQ(b)
- Q(b);OGATEB::B(B),XQ(b)
- R(c);N_GUARD::R1(G),XR(c)
- R(c);OGATEB::QAR(A),XR(c)
- R(c);N_GUARD::R1(G)
- B(f);OGATE::R1(H)
- P(a);OGATE::QAR1(A)
- Refutation
- B(f);XR(G)
- Try
- R(H);
- Vars
- Q(b);N_SPINQ(b),OGATE,XB(B)::QAB(A),XQ(b)
- Q(b);OGATEB::B(B),XQ(b)
- R(c);N_GUARD::R1(G),XR(c)
- R(c);OGATEB::QAR(A),XR(c)
- R(c);N_GUARD::R1(G)
- B(f);OGATE::R1(H)
- P(a);OGATE::QAR1(A)
- Refutation
- R(c);CHECK
- Try
- Q(A);
- Threat
- QAR2(A),XR(c)
- Vars
- R(c);N_GUARD,XQ(A)::R1(G)
- Q(b);OGATEB::B(B),XQ(b)
- R(c);N_GUARD::R1(G),XR(c)
- R(c);OGATE::QAB(A)
- R(c);N_GUARD::R1(G)
- R(c);N_GUARD,P_PINR(H)::R1(G)
- B(f);OGATE::R1(H)
- P(a);OGATE::QAR1(A)
- Refutation
- Q(b);N_SPINQ(b),XB(B)
- Try
- Q(A);P_PINP(a)
- Vars
- Q(b);N_SPINQ(b),OGATE,XB(B)::QAB(A),XQ(b)
- Q(b);OGATEB::B(B),XQ(b)
- R(c);N_GUARD::R1(G),XR(c)
- P(a);OGATEB::QAR2(A),XP(a)
- R(c);N_GUARD::R1(G)
- R(c);N_GUARD,P_PINR(H)::R1(G)
- B(f);OGATE::R1(H)
- Refutation
- R(c);
- Try
- Q(A);
- Vars
- R(c);N_GUARD::R1(G),XR(c)
- R(c);OGATEB::QAR(A),XR(c)
- R(c);N_GUARD::R1(G)
- R(c);N_GUARD,P_PINR(H)::R1(G)
- B(f);OGATE::R1(H)
- Refutation
- P(a);
- Try
- Q(A);
- Vars
- Q(b);N_SPINQ(b),OGATE,XB(B)::QAB(A),XQ(b)
- P(a);OGATEB::QAR2(A),XP(a)
- R(c);N_GUARD::R1(G)
- R(c);N_GUARD::R1(G),XR(c)
- R(c);N_GUARD,P_PINR(H)::R1(G)
- B(f);OGATE::R1(H)
- Refutation
- R(c);
- Try
- Q(A);
- Vars
- Q(b);OGATEB::B(B),XQ(b)
- P(a);OGATEB::QAR2(A),XP(a)
- R(c);OGATEB::QAR(A),XR(c)
- R(c);N_GUARD::R1(G)
- B(f);OGATE::R1(H)
- Refutation
- Q(b);N_SPINQ(b),XB(B)
- Try
- Actual
- Q(A);
- Threat
- QAR2(A),XR(c)
- Vars
- Q(b);N_SPINQ(b),OGATE,XB(B)::QAB(A),XQ(b)
- R(c);N_GUARD,XQ(A)::R1(G)
- R(c);N_GUARD::R1(G),XR(c)
- P(a);OGATEB::QAR2(A),XP(a)
- R(c);OGATE::QAB(A)
- Q(b);OGATEB::B(B),XQ(b)
- R(c);N_GUARD::R1(G)
- R(c);N_GUARD,P_PINR(H)::R1(G)
- B(f);OGATE::R1(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).