MESON Chess Problem Database
Problem Display
PID: 185814 (8/p2n3p/R1b4p/5k1P/1KP1R3/2Q4N/2B4n/8 w - - 0 1)
Gurr, John
The Observer, 1931
(First published on Sun Nov 29 1931)
#2
8 + 7
| 15239 | Valois Notebooks | 2018 |
SOLUTION
- SOUND
- Sets
- 1...Ba4
- 2.Rf4#
- 1...Bb5
- 2.Rf4#
- 2.Rh4#
- 1...Bd5
- 2.Rf4#
- 1...Bb7
- 2.Rf4#
- 1...Ba8
- 2.Rf4#
- 1...Sf1
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Sg4
- 2.Qf3#
- 1...Sc5
- 2.Qe5#
- 1...Se5
- 2.Qxe5#
- 1...Sb6
- 2.Qe5#
- 1...Sf6
- 2.Qe5#
- 1...Sb8
- 2.Qe5#
- 1...Sf8
- 2.Qe5#
- 1...Ba4
- Tries
- 1.Ka3?
- 1...Se5
- 2.Qxe5#
- 1...Ba4
- 2.Rf4#
- 1...Bb5
- 2.Rf4#
- 2.Rh4#
- 1...Bd5
- 2.Rf4#
- 1...Bb7
- 2.Rf4#
- 1...Ba8
- 2.Rf4#
- 1...Sf1
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Sg4
- 2.Qf3#
- 1...Sc5
- 2.Qe5#
- 1...Sb6
- 2.Qe5#
- 1...Sf6
- 2.Qe5#
- 1...Sb8
- 2.Qe5#
- 1...Sf8
- 2.Qe5#
- 1...Bxe4!
- 1...Se5
- 1.Ka5?
- 1...Se5
- 2.Qxe5#
- 1...Ba4
- 2.Rf4#
- 1...Bb5
- 2.Rf4#
- 2.Rh4#
- 1...Bd5
- 2.Rf4#
- 1...Bb7
- 2.Rf4#
- 1...Ba8
- 2.Rf4#
- 1...Sf1
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Sg4
- 2.Qf3#
- 1...Sc5
- 2.Qe5#
- 1...Sb6
- 2.Qe5#
- 1...Sf6
- 2.Qe5#
- 1...Sb8
- 2.Qe5#
- 1...Sf8
- 2.Qe5#
- 1...Bxe4!
- 1...Se5
- 1.Bb1?
- 1...Se5
- 2.Qxe5#
- 1...Ba4
- 2.Rf4#
- 1...Bb5
- 2.Rf4#
- 2.Rh4#
- 1...Bd5
- 2.Rf4#
- 1...Bb7
- 2.Rf4#
- 1...Ba8
- 2.Rf4#
- 1...Sf1
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Sg4
- 2.Qf3#
- 1...Sc5
- 2.Qe5#
- 1...Sb6
- 2.Qe5#
- 1...Sf6
- 2.Qe5#
- 1...Sb8
- 2.Qe5#
- 1...Sf8
- 2.Qe5#
- 1...Bxe4!
- 1...Se5
- 1.Bd1?
- 1...Kxe4
- 2.Bc2#
- 1...Se5
- 2.Qxe5#
- 1...Ba4
- 2.Rf4#
- 1...Bb5
- 2.Rf4#
- 1...Bd5
- 2.Rf4#
- 1...Bb7
- 2.Rf4#
- 1...Ba8
- 2.Rf4#
- 1...Sf1
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Sg4
- 2.Qf3#
- 1...Sc5
- 2.Qe5#
- 1...Sb6
- 2.Qe5#
- 1...Sf6
- 2.Re5#
- 2.Qe5#
- 1...Sb8
- 2.Qe5#
- 1...Sf8
- 2.Qe5#
- 1...Bxe4!
- 1...Kxe4
- 1.Bb3?
- 1...Kxe4
- 2.Bc2#
- 1...Se5
- 2.Qxe5#
- 1...Ba4
- 2.Rf4#
- 1...Bb5
- 2.Rf4#
- 1...Bd5
- 2.Rf4#
- 1...Bb7
- 2.Rf4#
- 1...Ba8
- 2.Rf4#
- 1...Sf1
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Sg4
- 2.Qf3#
- 1...Sc5
- 2.Qe5#
- 1...Sb6
- 2.Qe5#
- 1...Sf6
- 2.Qe5#
- 1...Sb8
- 2.Qe5#
- 1...Sf8
- 2.Qe5#
- 1...Bxe4!
- 1...Kxe4
- 1.Rh4+?
- 1...Be4
- 2.Bxe4#
- 2.Rf4#
- 1...Ke6!
- 1...Be4
- 1.Rxc6?
- threat
- 2.Rf4#
- 2.Rh4#
- 1...Sg4
- 2.Re1#
- 2.Re2#
- 2.Re3#
- 2.Rf4#
- 2.Re5#
- 2.Ree6#
- 2.Re7#
- 2.Re8#
- 2.Qf3#
- 1...Sc5
- 2.Rf4#
- 2.Rxc5#
- 2.Rf6#
- 2.Qe5#
- 2.Qf6#
- 1...Se5
- 2.Rf4#
- 2.Qxe5#
- 1...Sf6
- 2.Rf4#
- 2.Rxf6#
- 2.Qe5#
- 2.Qxf6#
- 1...a5+!
- threat
- 1.Qg3?
- threat
- 2.Qf4#
- 1...Se5
- 2.Qxe5#
- 1...Kf6!
- threat
- 1.c5?
- 1...Sxc5
- 2.Qe5#
- 1...Se5
- 2.Qxe5#
- 1...Ba4
- 2.Rf4#
- 1...Bb5
- 2.Rc4#
- 2.Rf4#
- 1...Bd5
- 2.Rf4#
- 1...Bb7
- 2.Rf4#
- 1...Ba8
- 2.Rf4#
- 1...Sf1
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Sg4
- 2.Qf3#
- 1...Sb6
- 2.Qe5#
- 1...Sf6
- 2.Qe5#
- 1...Sb8
- 2.Qe5#
- 1...Sf8
- 2.Qe5#
- 1...Bxe4!
- 1...Sxc5
- 1.Ka3?
- Keys
- 1.Ba4!
- 1...Kxe4
- 2.Bc2#
- 1...Bxa4
- 2.Rf4#
- 1...Bxe4
- 2.Bxd7#
- 1...Se5
- 2.Qxe5#
- 1...Bb5
- 2.Rf4#
- 1...Bd5
- 2.Rf4#
- 1...Bb7
- 2.Rf4#
- 1...Ba8
- 2.Rf4#
- 1...Sf1
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Sg4
- 2.Qf3#
- 1...Sc5
- 2.Qe5#
- 1...Sb6
- 2.Qe5#
- 1...Sf6
- 2.Qe5#
- 1...Sb8
- 2.Qe5#
- 1...Sf8
- 2.Qe5#
- 1...Kxe4
- 1.Ba4!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 0
- Sets
- B(c);::B(A)+R(F),DCHECK
- S(a);N_GUARD::QAR2(B)
- S(a);N_GUARD::QAR2(B),XS(a)
- S(f);N_GUARD::QAR1(B)
- S(f);N_GUARD::QAR1(B),XS(f)
- Tries
- Try
- K(D);S_FLIGHT
- Vars
- S(f);N_GUARD::QAR1(B),XS(f)
- B(c);::B(A)+R(F),DCHECK
- S(a);N_GUARD::QAR2(B)
- S(a);N_GUARD::QAR2(B),XS(a)
- S(f);N_GUARD::QAR1(B)
- Refutation
- B(c);P_SPINB(c),XR(F)
- Try
- K(D);S_FLIGHT
- Vars
- S(f);N_GUARD::QAR1(B),XS(f)
- B(c);::B(A)+R(F),DCHECK
- S(a);N_GUARD::QAR2(B)
- S(a);N_GUARD::QAR2(B),XS(a)
- S(f);N_GUARD::QAR1(B)
- Refutation
- B(c);P_SPINB(c),XR(F)
- Try
- B(A);
- Vars
- S(f);N_GUARD::QAR1(B),XS(f)
- B(c);::B(A)+R(F),DCHECK
- S(a);N_GUARD::QAR2(B)
- S(a);N_GUARD::QAR2(B),XS(a)
- S(f);N_GUARD::QAR1(B)
- Refutation
- B(c);P_SPINB(c),XR(F)
- Try
- B(A);
- Vars
- K(b);OGATEB,S_FLIGHT,XR(F)::B(A)
- S(f);N_GUARD::QAR1(B),XS(f)
- B(c);::R1(F)
- S(a);N_GUARD::QAR2(B)
- S(a);N_GUARD::QAR2(B),XS(a)
- S(f);N_GUARD::QAR1(B)
- Refutation
- B(c);XR(F)
- Try
- B(A);
- Vars
- K(b);OGATEB,S_FLIGHT,XR(F)::B(A)
- S(f);N_GUARD::QAR1(B),XS(f)
- B(c);::R1(F)
- S(a);N_GUARD::QAR2(B)
- S(a);N_GUARD::QAR2(B),XS(a)
- S(f);N_GUARD::QAR1(B)
- Refutation
- B(c);XR(F)
- Try
- R(F);CHECK
- Refutation
- K(b);P_SPINB(c),S_FLIGHT
- Try
- R(H);XB(c)
- Threat
- DUALS(2)
- Refutation
- P(e);CHECK
- Try
- Q(B);
- Threat
- QAR1(B)
- Vars
- S(f);N_GUARD::QAR1(B),XS(f)
- Refutation
- K(b);P-FLIGHT,P_SPINB(c)
- Try
- P(E);
- Vars
- S(f);N_GUARD,XP(E)::QAR1(B)
- S(f);N_GUARD::QAR1(B),XS(f)
- B(c);::B(A)+R(F),DCHECK
- S(a);N_GUARD::QAR2(B)
- S(a);N_GUARD::QAR2(B),XS(a)
- S(f);N_GUARD::QAR1(B)
- Refutation
- B(c);P_SPINB(c),XR(F)
- Try
- Actual
- B(A);
- Vars
- K(b);OGATEB,S_FLIGHT,XR(F)::B(A)
- B(c);XB(A)::R1(F)
- B(c);OGATE,SBLOCK,XR(F)::B(A),XS(f)
- S(f);N_GUARD::QAR1(B),XS(f)
- B(c);::R1(F)
- S(a);N_GUARD::QAR2(B)
- S(a);N_GUARD::QAR2(B),XS(a)
- S(f);N_GUARD::QAR1(B)
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