MESON Chess Problem Database
Problem Display
PID: 185766 (4N3/2nn1q2/Qp3N2/1BkPR3/K7/2B5/PPR5/1r4bb w - - 0 1)
Howard, Kenneth Samuel
The Observer, 1931
(First published on Sun Oct 4 1931)
#2
11 + 8
| 15239 | Valois Notebooks | 2018 |
SOLUTION
- SOUND
- Sets
- 1...Qxd5
- 2.Sxd7#
- 1...Qh5
- 2.Sxd7#
- 1...Qg6
- 2.Sxd7#
- 1...Qg8
- 2.Sxd7#
- 1...Qf8
- 2.Sxd7#
- 1...Ra1
- 2.b4#
- 1...Rc1
- 2.b4#
- 1...Rd1
- 2.b4#
- 1...Re1
- 2.b4#
- 1...Rf1
- 2.b4#
- 1...Rxb2
- 2.Bxb2#
- 1...Bd4
- 2.Bb4#
- 1...Be4
- 2.Sxe4#
- 1...Bxd5
- 2.Se4#
- 1...Sxb5
- 2.Qxb5#
- 1...Sxd5
- 2.Qc8#
- 1...Sxe5
- 2.Bxe5#
- 1...Qxd5
- Tries
- 1.Rg5?
- threat
- 2.Be5#
- 1...Qxd5
- 2.Sxd7#
- 1...Qxf6
- 2.Bxf6#
- 1...Rxb2
- 2.Bxb2#
- 1...Bxd5
- 2.Se4#
- 1...Sxb5
- 2.Qxb5#
- 1...Sxd5
- 2.Qc8#
- 1...Sxf6
- 2.Bxf6#
- 1...Qg6
- 2.Sxd7#
- 1...Rc1
- 2.b4#
- 1...Bd4
- 2.Bb4#
- 1...Be4
- 2.Sxe4#
- 1...Se5
- 2.Bxe5#
- 1...Qh7!
- threat
- 1.Rh5?
- threat
- 2.Be5#
- 1...Qxd5
- 2.Sxd7#
- 1...Qxf6
- 2.Bxf6#
- 1...Rxb2
- 2.Bxb2#
- 1...Bxd5
- 2.Se4#
- 1...Sxb5
- 2.Qxb5#
- 1...Sxd5
- 2.Qc8#
- 1...Sxf6
- 2.Bxf6#
- 1...Qg6
- 2.Sxd7#
- 1...Rc1
- 2.b4#
- 1...Bd4
- 2.Bb4#
- 1...Be4
- 2.Sxe4#
- 1...Se5
- 2.Bxe5#
- 1...Qh7!
- threat
- 1.d6+?
- 1...Qd5
- 2.Sxd7#
- 1...Bd5
- 2.Se4#
- 1...Sd5
- 2.Qc8#
- 1...Sxe5!
- 1...Qd5
- 1.Rg5?
- Keys
- 1.Rf5!
- threat
- 2.Be5#
- 1...Qxd5
- 2.Sxd7#
- 1...Qxf6
- 2.Bxf6#
- 1...Rxb2
- 2.Bxb2#
- 1...Bxd5
- 2.Se4#
- 1...Sxb5
- 2.Qxb5#
- 1...Sxd5
- 2.Qc8#
- 1...Sxf6
- 2.Bxf6#
- 1...Rc1
- 2.b4#
- 1...Bd4
- 2.Bb4#
- 1...Be4
- 2.Sxe4#
- 1...Se5
- 2.Bxe5#
- threat
- 1.Rf5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 8
- Sets
- Q(h);N_GUARD,P_SPINQ(h),XP(G)::S(J),XS(g)
- Q(h);N_GUARD::S(J),XS(g)
- R(a);N_GUARD,P_PINP(A)::P(B)
- R(a);N_GUARD::P(B)
- R(a);OGATE,XP(B)::R(C)+B(D),XR(a)
- B(b);SBLOCK::R(C)+B(D),DCHECK
- B(c);N_GUARD::S(J),XB(c)
- B(c);N_GUARD,P_SPINB(c),XP(G)::S(J)
- S(f);OGATE,XB(F)::QAR1(I),XS(f)
- S(f);OGATEB,P_SPINS(f),XP(G)::QAR(I)
- S(g);OGATE,XR(H)::R(C)+B(D),XS(g)
- Tries
- Try
- R(H);
- Threat
- R(C)+B(D)
- Vars
- Q(h);N_GUARD,P_SPINQ(h),XP(G)::S(J),XS(g)
- Q(h);OGATE,XS(J)::R(C)+B(D),XQ(h)
- R(a);OGATE,XP(B)::R(C)+B(D),XR(a)
- B(c);N_GUARD,P_SPINB(c),XP(G)::S(J)
- S(f);OGATE,XB(F)::QAR1(I),XS(f)
- S(f);OGATEB,P_SPINS(f),XP(G)::QAR(I)
- S(g);OGATE,XS(J)::R(C)+B(D),XS(g)
- Q(h);N_GUARD::S(J),XS(g)
- R(a);N_GUARD::P(B)
- B(b);SBLOCK::R(C)+B(D),DCHECK
- B(c);N_GUARD::S(J),XB(c)
- S(g);::R(C)+B(D),XS(g)
- Refutation
- Q(h);
- Try
- R(H);
- Threat
- R(C)+B(D)
- Vars
- Q(h);N_GUARD,P_SPINQ(h),XP(G)::S(J),XS(g)
- Q(h);OGATE,XS(J)::R(C)+B(D),XQ(h)
- R(a);OGATE,XP(B)::R(C)+B(D),XR(a)
- B(c);N_GUARD,P_SPINB(c),XP(G)::S(J)
- S(f);OGATE,XB(F)::QAR1(I),XS(f)
- S(f);OGATEB,P_SPINS(f),XP(G)::QAR(I)
- S(g);OGATE,XS(J)::R(C)+B(D),XS(g)
- Q(h);N_GUARD::S(J),XS(g)
- R(a);N_GUARD::P(B)
- B(b);SBLOCK::R(C)+B(D),DCHECK
- B(c);N_GUARD::S(J),XB(c)
- S(g);::R(C)+B(D),XS(g)
- Refutation
- Q(h);
- Try
- P(G);CHECK
- Vars
- Q(h);P_SPINQ(h)::S(J),XS(g)
- B(c);P_SPINB(c)::S(J)
- S(f);P_SPINS(f),S_CUTB(c),S_CUTQ(h),S_CUTS(g)::QAR(I)
- Refutation
- S(g);XR(H)
- Try
- Actual
- R(H);
- Threat
- R(C)+B(D)
- Vars
- Q(h);N_GUARD,P_SPINQ(h),XP(G)::S(J),XS(g)
- Q(h);OGATE,XS(J)::R(C)+B(D),XQ(h)
- R(a);OGATE,XP(B)::R(C)+B(D),XR(a)
- B(c);N_GUARD,P_SPINB(c),XP(G)::S(J)
- S(f);OGATE,XB(F)::QAR1(I),XS(f)
- S(f);OGATEB,P_SPINS(f),XP(G)::QAR(I)
- S(g);OGATE,XS(J)::R(C)+B(D),XS(g)
- R(a);N_GUARD::P(B)
- B(b);SBLOCK::R(C)+B(D),DCHECK
- B(c);N_GUARD::S(J),XB(c)
- S(g);::R(C)+B(D),XS(g)
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