MESON Chess Problem Database
Problem Display
PID: 200105 (8/8/8/1p5Q/1P1K4/B2N1Np1/B1kp1pR1/8 w - - 0 1)
Dale, John
The Observer, 1947
(First published on Sun Nov 2 1947)
#2
8 + 5
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Kd1
- 2.Sfe1#
- 1...d1Q
- 2.Qc5#
- 1...d1S
- 2.Sde1#
- 1...d1B
- 2.Sde1#
- 2.Qc5#
- 1...d1R
- 2.Qc5#
- 1...f1Q
- 2.Rxd2#
- 1...f1S
- 2.Sfe1#
- 1...f1B
- 2.Sfe1#
- 2.Rxd2#
- 1...f1R
- 2.Rxd2#
- 1...Kd1
- Tries
- 1.Sxd2?
- 1...f1Q
- 2.Sxf1#
- 2.Bb3#
- 1...f1S
- 2.Sxf1#
- 2.Se1#
- 2.Bb1#
- 2.Bb3#
- 1...f1B
- 2.Sxf1#
- 2.Se1#
- 2.Bb1#
- 2.Bb3#
- 1...f1R
- 2.Sxf1#
- 2.Bb3#
- 1...Kxd2!
- 1...f1Q
- 1.Bb2?
- 1...Kd1
- 2.Sfe1#
- 1...d1Q
- 2.Qc5#
- 1...d1B
- 2.Qc5#
- 1...d1R
- 2.Qc5#
- 1...f1Q
- 2.Rxd2#
- 1...f1S
- 2.Sfe1#
- 1...f1B
- 2.Sfe1#
- 2.Rxd2#
- 1...f1R
- 2.Rxd2#
- 1...d1S!
- 1...Kd1
- 1.Rxf2?
- threat
- 2.Sfe1#
- 2.Rxd2#
- 1...Kd1
- 2.Sfe1#
- 2.Bb3#
- 2.Rxd2#
- 1...gxf2!
- threat
- 1.Qg6?
- threat
- 2.Sxf2#
- 1...d1Q
- 2.Qc6#
- 1...d1R
- 2.Qc6#
- 1...f1Q
- 2.Rxd2#
- 1...f1S
- 2.Sf2#
- 1...f1B
- 2.Rxd2#
- 1...f1R
- 2.Sf2#
- 2.Rxd2#
- 1...Kd1!
- threat
- 1.Qe8?
- 1...Kd1
- 2.Bb3#
- 1...d1Q
- 2.Qc6#
- 2.Qc8#
- 1...d1S
- 2.Sde1#
- 2.Qe2#
- 1...d1B
- 2.Sde1#
- 2.Qc6#
- 2.Qc8#
- 1...d1R
- 2.Qc6#
- 2.Qc8#
- 1...f1Q
- 2.Rxd2#
- 1...f1B
- 2.Rxd2#
- 1...f1R
- 2.Rxd2#
- 1...f1S!
- 1...Kd1
- 1.Qe5?
- 1...Kd1
- 2.Bb3#
- 1...d1Q
- 2.Qc7#
- 2.Qc5#
- 1...d1S
- 2.Sde1#
- 2.Qe2#
- 1...d1B
- 2.Sde1#
- 2.Qc7#
- 2.Qc5#
- 1...d1R
- 2.Qc7#
- 2.Qc5#
- 1...f1Q
- 2.Rxd2#
- 1...f1B
- 2.Rxd2#
- 1...f1R
- 2.Rxd2#
- 1...f1S!
- 1...Kd1
- 1.Qf5?
- threat
- 2.Sxf2#
- 1...d1Q
- 2.Qc8#
- 2.Qc5#
- 1...d1R
- 2.Qc8#
- 2.Qc5#
- 1...f1Q
- 2.Rxd2#
- 1...f1S
- 2.Sf2#
- 1...f1B
- 2.Rxd2#
- 1...f1R
- 2.Sf2#
- 2.Rxd2#
- 1...Kd1!
- threat
- 1.Qg5?
- threat
- 2.Qxd2#
- 1...Kd1
- 2.Qxd2#
- 1...d1Q
- 2.Qc5#
- 1...d1S
- 2.Sde1#
- 2.Sfe1#
- 2.Qc1#
- 2.Qd2#
- 1...d1B
- 2.Sde1#
- 2.Sfe1#
- 2.Qc1#
- 2.Qd2#
- 2.Qc5#
- 1...d1R
- 2.Qc5#
- 1...f1S!
- threat
- 1.Qh6?
- threat
- 2.Qxd2#
- 1...Kd1
- 2.Qxd2#
- 1...d1Q
- 2.Qc6#
- 1...d1S
- 2.Sde1#
- 2.Sfe1#
- 2.Qc1#
- 2.Qd2#
- 1...d1B
- 2.Sde1#
- 2.Sfe1#
- 2.Qc1#
- 2.Qd2#
- 2.Qc6#
- 1...d1R
- 2.Qc6#
- 1...f1S!
- threat
- 1.Qh7?
- threat
- 2.Sxf2#
- 1...d1Q
- 2.Qc7#
- 1...d1R
- 2.Qc7#
- 1...f1Q
- 2.Rxd2#
- 1...f1S
- 2.Sf2#
- 1...f1B
- 2.Rxd2#
- 1...f1R
- 2.Sf2#
- 2.Rxd2#
- 1...Kd1!
- threat
- 1.Sxd2?
- Keys
- 1.Qg4!
- 1...Kd1
- 2.Sfe1#
- 1...d1Q
- 2.Qc8#
- 1...d1S
- 2.Sde1#
- 1...d1B
- 2.Sde1#
- 2.Qc8#
- 1...d1R
- 2.Qc8#
- 1...f1Q
- 2.Rxd2#
- 1...f1S
- 2.Sfe1#
- 1...f1B
- 2.Sfe1#
- 2.Rxd2#
- 1...f1R
- 2.Rxd2#
- 1...Kd1
- 1.Qg4!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 2
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- K(a);S_FLIGHT::QAB(H)+S(E)
- P(b);P_PINS(D),P_SPINP(c),SBLOCK::QAR(H)
- P(b);N_GUARD,P_SPINP(c),SBLOCK::S(D)
- P(c);OGATE,P_SPINP(b)::R1(B),XP(b)
- P(c);N_GUARD,P_SPINP(b)::S(E)
- Tries
- Try
- S(E);XP(b)
- Refutation
- K(a);P-FLIGHT,P_SPINP(c),XS(E)
- Try
- B(C);
- Vars
- K(a);S_FLIGHT::QAB(H)+S(E)
- P(b);P_PINS(D),P_SPINP(c),SBLOCK::QAR(H)
- P(b);P_SPINP(c),SBLOCK::QAR(H)
- P(c);OGATE,P_SPINP(b)::R1(B),XP(b)
- P(c);N_GUARD,P_SPINP(b)::S(E)
- Refutation
- P(b);P_SPINP(c)
- Try
- R(B);P_PINP(b),XP(c)
- Threat
- DUALS(2)
- Refutation
- P(d);N_SPINP(b),XR(B)
- Try
- Q(H);
- Threat
- QAB(H)+S(D),XP(c)
- Vars
- P(b);P_PINS(D),P_SPINP(c),SBLOCK::QAR(H)
- P(c);OGATE,P_SPINP(b)::R1(B),XP(b)
- P(c);P_SPINP(b)::QAB(H)+S(D)
- Refutation
- K(a);S_FLIGHT
- Try
- Q(H);
- Vars
- K(a);S_FLIGHT::B(A)
- P(c);OGATE,P_SPINP(b)::R1(B),XP(b)
- Refutation
- P(c);P_SPINP(b)
- Try
- Q(H);
- Vars
- K(a);S_FLIGHT::B(A)
- P(c);OGATE,P_SPINP(b)::R1(B),XP(b)
- Refutation
- P(c);P_SPINP(b)
- Try
- Q(H);
- Threat
- QAB(H)+S(D),XP(c)
- Vars
- P(c);OGATE,P_SPINP(b)::R1(B),XP(b)
- P(c);P_SPINP(b)::QAB(H)+S(D)
- Refutation
- K(a);S_FLIGHT
- Try
- Q(H);
- Threat
- QAR1(H),XP(b)
- Vars
- K(a);S_FLIGHT::QAR1(H),XP(b)
- P(b);P_PINS(D),P_SPINP(c),SBLOCK::QAR(H)
- Refutation
- P(c);P_SPINP(b)
- Try
- Q(H);
- Threat
- QAR1(H),XP(b)
- Vars
- K(a);S_FLIGHT::QAR1(H),XP(b)
- P(b);P_PINS(D),P_SPINP(c),SBLOCK::QAR(H)
- Refutation
- P(c);P_SPINP(b)
- Try
- Q(H);
- Threat
- QAB(H)+S(D),XP(c)
- Vars
- P(b);P_PINS(D),P_SPINP(c),SBLOCK::QAR(H)
- P(c);OGATE,P_SPINP(b)::R1(B),XP(b)
- P(c);P_SPINP(b)::QAB(H)+S(D)
- Refutation
- K(a);S_FLIGHT
- Try
- Actual
- Q(H);
- Vars
- K(a);S_FLIGHT::QAB(H)+S(E)
- P(b);P_PINS(D),P_SPINP(c),SBLOCK::QAR(H)
- P(b);N_GUARD,P_SPINP(c),SBLOCK::S(D)
- P(c);OGATE,P_SPINP(b)::R1(B),XP(b)
- P(c);N_GUARD,P_SPINP(b)::S(E)
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).