MESON Chess Problem Database
Problem Display
PID: 201062 (1Q6/4pN2/3p3p/n1p3nR/R1pk1NK1/2pP4/5P2/8 w - - 0 1)
Coward, John R
The Observer, 1949
(First published on Sun Oct 30 1949)
#2
8 + 9
| 15239 | Valois Notebooks | 2020 |
SOLUTION
- SOUND
- Sets
- 1...Sb3
- 2.Rxc4#
- 1...Sc6
- 2.Rxc4#
- 1...Sb7
- 2.Rxc4#
- 1...Sf3
- 2.Rd5#
- 1...Sh3
- 2.Rd5#
- 1...Se4
- 2.Rd5#
- 1...Se6
- 2.Rd5#
- 1...Sxf7
- 2.Rd5#
- 1...Sh7
- 2.Rd5#
- 1...c2
- 2.Qb2#
- 1...d5
- 2.Qe5#
- 1...e5
- 2.Qxd6#
- 1...e6
- 2.Qxd6#
- 1...Sb3
- Tries
- 1.Kg3?
- 1...Sxf7
- 2.Rd5#
- 1...c2
- 2.Qb2#
- 1...Sb3
- 2.Rxc4#
- 1...Sc6
- 2.Rxc4#
- 1...Sb7
- 2.Rxc4#
- 1...Sf3
- 2.Rd5#
- 1...Sh3
- 2.Rd5#
- 1...Se6
- 2.Rd5#
- 1...Sh7
- 2.Rd5#
- 1...d5
- 2.Qe5#
- 1...e5
- 2.Qxd6#
- 1...e6
- 2.Qxd6#
- 1...Se4+!
- 1...Sxf7
- 1.Kh4?
- 1...Sxf7
- 2.Rd5#
- 1...c2
- 2.Qb2#
- 1...Sb3
- 2.Rxc4#
- 1...Sc6
- 2.Rxc4#
- 1...Sb7
- 2.Rxc4#
- 1...Sh3
- 2.Rd5#
- 1...Se4
- 2.Rd5#
- 1...Se6
- 2.Rd5#
- 1...Sh7
- 2.Rd5#
- 1...d5
- 2.Qe5#
- 1...e5
- 2.Qxd6#
- 1...e6
- 2.Qxd6#
- 1...Sf3+!
- 1...Sxf7
- 1.Sxg5?
- threat
- 2.Sf3#
- 2.Sge6#
- 1...Ke5
- 2.Qh8#
- 1...c2
- 2.Qb2#
- 1...e6
- 2.Sf3#
- 2.Sgxe6#
- 2.Qxd6#
- 1...hxg5!
- threat
- 1.Sxd6?
- threat
- 2.Sb5#
- 2.Sf5#
- 1...exd6
- 2.Qxd6#
- 2.Qh8#
- 1...c2
- 2.Sb5#
- 2.Qb2#
- 1...e6
- 2.Sb5#
- 1...Ke5!
- threat
- 1.Rb4?
- 1...Sxf7
- 2.Rd5#
- 1...cxb4
- 2.Qa7#
- 2.Qb6#
- 1...Sb3
- 2.Rxc4#
- 1...Sc6
- 2.Rxc4#
- 1...Sb7
- 2.Rxc4#
- 1...Sf3
- 2.Rd5#
- 1...Sh3
- 2.Rd5#
- 1...Se4
- 2.Rd5#
- 1...Se6
- 2.Rd5#
- 1...Sh7
- 2.Rd5#
- 1...d5
- 2.Qe5#
- 1...e5
- 2.Qxd6#
- 1...e6
- 2.Qxd6#
- 1...c2!
- 1...Sxf7
- 1.Qc7?
- 1...Sxf7
- 2.Rd5#
- 1...Sb3
- 2.Rxc4#
- 1...Sc6
- 2.Rxc4#
- 1...Sb7
- 2.Rxc4#
- 1...Sf3
- 2.Rd5#
- 1...Sh3
- 2.Rd5#
- 1...Se4
- 2.Rd5#
- 1...Se6
- 2.Rd5#
- 1...Sh7
- 2.Rd5#
- 1...d5
- 2.Qe5#
- 1...e5
- 2.Qxd6#
- 1...e6
- 2.Qxd6#
- 1...c2!
- 1...Sxf7
- 1.Qb6?
- 1...Sxf7
- 2.Rd5#
- 1...c2
- 2.Qb2#
- 1...Sb3
- 2.Rxc4#
- 1...Sc6
- 2.Rxc4#
- 1...Sb7
- 2.Rxc4#
- 1...Sf3
- 2.Rd5#
- 1...Sh3
- 2.Rd5#
- 1...Se4
- 2.Rd5#
- 1...Se6
- 2.Rd5#
- 1...Sh7
- 2.Rd5#
- 1...e5
- 2.Qxd6#
- 1...e6
- 2.Qxd6#
- 1...d5!
- 1...Sxf7
- 1.Qb7?
- threat
- 2.Qd5#
- 1...Sxb7
- 2.Rxc4#
- 1...c2
- 2.Qb2#
- 1...d5
- 2.Qxd5#
- 1...Sc6
- 2.Rxc4#
- 1...e6!
- threat
- 1.Qd8?
- 1...Sxf7
- 2.Rd5#
- 1...d5
- 2.Qxd5#
- 1...Sb3
- 2.Rxc4#
- 1...Sc6
- 2.Rxc4#
- 1...Sb7
- 2.Rxc4#
- 1...Sf3
- 2.Rd5#
- 1...Sh3
- 2.Rd5#
- 1...Se4
- 2.Rd5#
- 1...Se6
- 2.Rd5#
- 1...Sh7
- 2.Rd5#
- 1...e5
- 2.Qxd6#
- 1...e6
- 2.Qxd6#
- 1...c2!
- 1...Sxf7
- 1.Kg3?
- Keys
- 1.Se5!
- 1...Kxe5
- 2.Qh8#
- 1...dxe5
- 2.Qd8#
- 1...c2
- 2.Qb2#
- 1...Sb3
- 2.Sc6#
- 1...Sc6
- 2.Sxc6#
- 1...Sb7
- 2.Sc6#
- 1...Sf3
- 2.Sxf3#
- 1...Sh3
- 2.Sf3#
- 1...Se4
- 2.Sf3#
- 1...Se6
- 2.Sf3#
- 1...Sf7
- 2.Sf3#
- 1...Sh7
- 2.Sf3#
- 1...d5
- 2.Se2#
- 1...e6
- 2.Qxd6#
- 1...Kxe5
- 1.Se5!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 10
- ADDED MATES = 2
- REMOVED MATES = 1
- Sets
- S(d);N_GUARD::R1(C),XP(b)
- S(f);OGATE::R1(F)
- S(f);OGATE,XS(G)::R1(F)
- P(a);OGATEB::QAB(H)
- P(g);OGATE::QAB1(H)
- P(i);N_GUARD::QAR2(H),XP(g)
- Tries
- Try
- K(E);P-FLIGHT
- Vars
- S(f);OGATE,XS(G)::R1(F)
- P(a);OGATEB::QAB(H)
- S(d);N_GUARD::R1(C),XP(b)
- S(f);OGATE::R1(F)
- P(g);OGATE::QAB1(H)
- P(i);N_GUARD::QAR2(H),XP(g)
- Refutation
- S(f);CHECK
- Try
- K(E);P-FLIGHT
- Vars
- S(f);OGATE,XS(G)::R1(F)
- P(a);OGATEB::QAB(H)
- S(d);N_GUARD::R1(C),XP(b)
- S(f);OGATE::R1(F)
- P(g);OGATE::QAB1(H)
- P(i);N_GUARD::QAR2(H),XP(g)
- Refutation
- S(f);CHECK
- Try
- S(G);XS(f)
- Threat
- DUALS(2)
- Vars
- K(c);N_SPINP(b),P_SPINP(g),S_FLIGHT::QAB(H)
- P(a);OGATEB::QAB(H)
- Refutation
- P(h);XS(G)
- Try
- S(G);XP(g)
- Threat
- DUALS(2)
- Vars
- P(i);::S(G)
- Refutation
- K(c);N_SPINP(b),P_SPINS(f),S_FLIGHT
- Try
- R(C);
- Vars
- S(f);OGATE,XS(G)::R1(F)
- S(d);N_GUARD::R1(C),XP(b)
- S(f);OGATE::R1(F)
- P(g);OGATE::QAB1(H)
- P(i);N_GUARD::QAR2(H),XP(g)
- Refutation
- P(a);
- Try
- Q(H);
- Vars
- S(f);OGATE,XS(G)::R1(F)
- S(d);N_GUARD::R1(C),XP(b)
- S(f);OGATE::R1(F)
- P(g);OGATE::QAB1(H)
- P(i);N_GUARD::QAR2(H),XP(g)
- Refutation
- P(a);
- Try
- Q(H);
- Vars
- S(f);OGATE,XS(G)::R1(F)
- P(a);OGATEB::QAB(H)
- S(d);N_GUARD::R1(C),XP(b)
- S(f);OGATE::R1(F)
- P(i);N_GUARD::QAR2(H),XP(g)
- Refutation
- P(g);
- Try
- Q(H);
- Threat
- QAR1(H)
- Vars
- S(d);N_GUARD,XQ(H)::R1(C),XP(b)
- P(a);OGATEB::QAB(H)
- P(g);::QAR1(H),XP(g)
- S(d);N_GUARD::R1(C),XP(b)
- Refutation
- P(i);
- Try
- Q(H);
- Vars
- S(f);OGATE,XS(G)::R1(F)
- P(g);OGATE::QAR1(H),XP(g)
- S(d);N_GUARD::R1(C),XP(b)
- S(f);OGATE::R1(F)
- P(i);N_GUARD::QAR2(H),XP(g)
- Refutation
- P(a);
- Try
- Actual
- S(G);
- Vars
- K(c);N_SPINP(b),OGATEB,P_SPINP(g),P_SPINS(f),S_FLIGHT,XS(G)::QAB(H)
- P(g);OGATEB,SBLOCK,XS(G)::QAR(H)
- P(a);OGATEB::QAB(H)
- S(d);N_GUARD::S(G)
- S(d);N_GUARD::S(G),XS(d)
- S(f);N_GUARD::S(G),XS(f)
- S(f);N_GUARD::S(G)
- P(g);SBLOCK::S(D)
- P(i);N_GUARD::QAR2(H),XP(g)
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