MESON Chess Problem Database
Problem Display
PID: 199576 (b1N4R/1n2R3/B1p1P3/3k2r1/3p2N1/8/2Q5/5K2 w - - 0 1)
Stewart, John
The Observer, 1946
(First published on Sun Mar 10 1946)
#2
8 + 6
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Rxg4
- 2.Qf5#
- 1...Re5
- 2.Sf6#
- 1...Rf5+
- 2.Qxf5#
- 1...Rh5
- 2.Rxh5#
- 1...Rg6
- 2.Qf5#
- 1...Rg7
- 2.Qf5#
- 1...Rg8
- 2.Qf5#
- 1...Sa5
- 2.Rd8#
- 1...Sc5
- 2.Bc4#
- 1...Sd6
- 2.Sb6#
- 1...Sd8
- 2.Rxd8#
- 1...d3
- 2.Qc4#
- 1...c5
- 2.Qg2#
- 1...Rxg4
- Tries
- 1.Ke1?
- 1...Rxg4
- 2.Qf5#
- 1...d3
- 2.Qc4#
- 1...c5
- 2.Qg2#
- 1...Rf5
- 2.Qxf5#
- 1...Rh5
- 2.Rxh5#
- 1...Rg6
- 2.Qf5#
- 1...Rg7
- 2.Qf5#
- 1...Rg8
- 2.Qf5#
- 1...Sa5
- 2.Rd8#
- 1...Sc5
- 2.Bc4#
- 1...Sd6
- 2.Sb6#
- 1...Sd8
- 2.Rxd8#
- 1...Re5+!
- 1...Rxg4
- 1.Kg1?
- 1...d3
- 2.Qc4#
- 1...c5
- 2.Qg2#
- 1...Re5
- 2.Sf6#
- 1...Rf5
- 2.Qxf5#
- 1...Rh5
- 2.Rxh5#
- 1...Rg6
- 2.Qf5#
- 1...Rg7
- 2.Qf5#
- 1...Rg8
- 2.Qf5#
- 1...Sa5
- 2.Rd8#
- 1...Sc5
- 2.Bc4#
- 1...Sd6
- 2.Sb6#
- 1...Sd8
- 2.Rxd8#
- 1...Rxg4+!
- 1...d3
- 1.Kf2?
- 1...Rf5+
- 2.Qxf5#
- 1...Rxg4
- 2.Qf5#
- 1...d3
- 2.Qc4#
- 1...Re5
- 2.Sf6#
- 1...Rh5
- 2.Rxh5#
- 1...Rg6
- 2.Qf5#
- 1...Rg7
- 2.Qf5#
- 1...Rg8
- 2.Qf5#
- 1...Sa5
- 2.Rd8#
- 1...Sc5
- 2.Bc4#
- 1...Sd6
- 2.Sb6#
- 1...Sd8
- 2.Rxd8#
- 1...c5!
- 1...Rf5+
- 1.Be2?
- threat
- 2.Bf3#
- 1...Rf5+
- 2.Qxf5#
- 1...Rxg4
- 2.Qf5#
- 1...Re5
- 2.Sf6#
- 1...Sc5
- 2.Bc4#
- 1...Sd6
- 2.Sb6#
- 1...d3!
- threat
- 1.Bb5?
- threat
- 2.Bxc6#
- 2.Qxc6#
- 1...Rf5+
- 2.Qxf5#
- 1...Rxg4
- 2.Qf5#
- 1...d3
- 2.Qc4#
- 1...Sa5
- 2.Rd8#
- 1...Sc5
- 2.Bc4#
- 1...Sd6
- 2.Sb6#
- 1...Sd8
- 2.Rxd8#
- 1...c5
- 2.Qg2#
- 1...cxb5!
- threat
- 1.Rd7+?
- 1...Sd6
- 2.Rxd6#
- 1...Kxe6!
- 1...Sd6
- 1.Rh5?
- threat
- 2.Rxg5#
- 1...Rf5+
- 2.Rxf5#
- 2.Qxf5#
- 1...d3
- 2.Qc4#
- 1...c5
- 2.Qg2#
- 1...Re5
- 2.Sf6#
- 2.Rxe5#
- 1...Sd6
- 2.Sb6#
- 1...Rxh5!
- threat
- 1.Rd8+?
- 1...Sd6
- 2.Sb6#
- 2.Rxd6#
- 1...Sxd8!
- 1...Sd6
- 1.Rhe8?
- 1...Rf5+
- 2.Qxf5#
- 1...Rxg4
- 2.Qf5#
- 1...d3
- 2.Qc4#
- 1...c5
- 2.Qg2#
- 1...Sa5
- 2.Rd7#
- 2.Rd8#
- 1...Re5
- 2.Sf6#
- 1...Rg6
- 2.Qf5#
- 1...Rg7
- 2.Qf5#
- 1...Rg8
- 2.Qf5#
- 1...Sc5
- 2.Bc4#
- 1...Sd6
- 2.Sb6#
- 1...Sd8
- 2.Rd7#
- 2.Rxd8#
- 1...Rh5!
- 1...Rf5+
- 1.Rf8?
- 1...Rf5+
- 2.Rxf5#
- 2.Qxf5#
- 1...Rxg4
- 2.Rf5#
- 2.Qf5#
- 1...d3
- 2.Qc4#
- 1...c5
- 2.Qg2#
- 1...Sa5
- 2.Rd8#
- 1...Re5
- 2.Sf6#
- 1...Rg6
- 2.Rf5#
- 2.Qf5#
- 1...Rg7
- 2.Rf5#
- 2.Qf5#
- 1...Rg8
- 2.Rf5#
- 2.Qf5#
- 1...Sc5
- 2.Bc4#
- 1...Sd6
- 2.Sb6#
- 1...Sd8
- 2.Rxd8#
- 1...Rh5!
- 1...Rf5+
- 1.Rg8?
- threat
- 2.Rxg5#
- 1...Rf5+
- 2.Qxf5#
- 1...Rxg4
- 2.Qf5#
- 1...Rxg8
- 2.Qf5#
- 1...d3
- 2.Qc4#
- 1...c5
- 2.Qg2#
- 1...Re5
- 2.Sf6#
- 1...Rg6
- 2.Qf5#
- 1...Rg7
- 2.Qf5#
- 1...Sd6
- 2.Sb6#
- 1...Rh5!
- threat
- 1.Qb3+?
- 1...Kc5
- 2.Qc4#
- 1...Ke4!
- 1...Kc5
- 1.Qa2+?
- 1...Kc5
- 2.Qc4#
- 1...Ke4!
- 1...Kc5
- 1.Ke1?
- Keys
- 1.Rh6!
- 1...Rf5+
- 2.Qxf5#
- 1...Rxg4
- 2.Qf5#
- 1...d3
- 2.Qc4#
- 1...c5
- 2.Qg2#
- 1...Sa5
- 2.Rd7#
- 1...Re5
- 2.Sf6#
- 1...Rh5
- 2.Rxh5#
- 1...Rg6
- 2.Qf5#
- 1...Rg7
- 2.Qf5#
- 1...Rg8
- 2.Qf5#
- 1...Sc5
- 2.Bc4#
- 1...Sd6
- 2.Sb6#
- 1...Sd8
- 2.Rd7#
- 1...Rf5+
- 1.Rh6!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 2
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- R(c);N_GUARD,XS(C)::QAR2(B)
- R(c);SBLOCK::S(C)
- R(c);CHECK,N_GUARD::QAR2(B),XR(c)
- R(c);OGATEB::R(H),XR(c)
- R(c);N_GUARD::QAR2(B)
- S(e);N_GUARD::R(H)
- S(e);SBLOCK::B(D)
- S(e);SBLOCK::S(G)
- S(e);N_GUARD::R(H),XS(e)
- P(a);::QAB1(B)
- P(d);SBLOCK::QAB(B)
- Tries
- Try
- K(A);P-FLIGHT
- Vars
- R(c);N_GUARD,XS(C)::QAR2(B)
- P(a);::QAB1(B)
- P(d);SBLOCK::QAB(B)
- R(c);N_GUARD::QAR2(B),XR(c)
- R(c);OGATEB::R(H),XR(c)
- R(c);N_GUARD::QAR2(B)
- S(e);N_GUARD::R(H)
- S(e);SBLOCK::B(D)
- S(e);SBLOCK::S(G)
- S(e);N_GUARD::R(H),XS(e)
- Refutation
- R(c);CHECK
- Try
- K(A);P-FLIGHT,P_SPINS(C)
- Vars
- P(a);::QAB1(B)
- P(d);SBLOCK::QAB(B)
- R(c);N_PINS(C),SBLOCK::S(C)
- R(c);N_GUARD,N_PINS(C)::QAR2(B),XR(c)
- R(c);N_PINS(C),OGATEB::R(H),XR(c)
- R(c);N_GUARD::QAR2(B)
- S(e);N_GUARD::R(H)
- S(e);SBLOCK::B(D)
- S(e);SBLOCK::S(G)
- S(e);N_GUARD::R(H),XS(e)
- Refutation
- R(c);CHECK,XS(C)
- Try
- K(A);P-FLIGHT
- Vars
- R(c);CHECK,N_GUARD::QAR2(B),XR(c)
- R(c);N_GUARD,XS(C)::QAR2(B)
- P(a);::QAB1(B)
- R(c);SBLOCK::S(C)
- R(c);OGATEB::R(H),XR(c)
- R(c);N_GUARD::QAR2(B)
- S(e);N_GUARD::R(H)
- S(e);SBLOCK::B(D)
- S(e);SBLOCK::S(G)
- S(e);N_GUARD::R(H),XS(e)
- Refutation
- P(d);
- Try
- B(D);
- Threat
- B(D)
- Vars
- R(c);CHECK,N_GUARD::QAR2(B),XR(c)
- R(c);N_GUARD,XS(C)::QAR2(B)
- R(c);SBLOCK::S(C)
- S(e);SBLOCK::B(D)
- S(e);SBLOCK::S(G)
- Refutation
- P(a);
- Try
- B(D);
- Threat
- DUALS(2)
- Vars
- R(c);CHECK,N_GUARD::QAR2(B),XR(c)
- R(c);N_GUARD,XS(C)::QAR2(B)
- P(a);::QAB1(B)
- S(e);N_GUARD::R(H)
- S(e);SBLOCK::B(D)
- S(e);SBLOCK::S(G)
- S(e);N_GUARD::R(H),XS(e)
- P(d);SBLOCK::QAB(B)
- Refutation
- P(d);XB(D)
- Try
- R(F);CHECK
- Vars
- S(e);N_GUARD,P_SPINS(e)::R1(F),XS(e)
- Refutation
- K(b);S_FLIGHT,XP(E)
- Try
- R(H);P_PINR(c)
- Threat
- R(H),XR(c)
- Vars
- P(a);::QAB1(B)
- P(d);SBLOCK::QAB(B)
- S(e);SBLOCK::S(G)
- Refutation
- R(c);N_SPINR(c),XR(H)
- Try
- R(H);CHECK
- Refutation
- S(e);XR(H)
- Try
- R(H);
- Vars
- R(c);CHECK,N_GUARD::QAR2(B),XR(c)
- R(c);N_GUARD,XS(C)::QAR2(B)
- P(a);::QAB1(B)
- P(d);SBLOCK::QAB(B)
- R(c);SBLOCK::S(C)
- R(c);N_GUARD::QAR2(B)
- S(e);SBLOCK::B(D)
- S(e);SBLOCK::S(G)
- Refutation
- R(c);
- Try
- R(H);
- Vars
- P(a);::QAB1(B)
- P(d);SBLOCK::QAB(B)
- S(e);N_GUARD::R(H)
- R(c);SBLOCK::S(C)
- S(e);SBLOCK::B(D)
- S(e);SBLOCK::S(G)
- S(e);N_GUARD::R(H),XS(e)
- Refutation
- R(c);
- Try
- R(H);
- Threat
- R(H),XR(c)
- Vars
- R(c);CHECK,N_GUARD::QAR2(B),XR(c)
- R(c);N_GUARD,XS(C)::QAR2(B)
- R(c);N_GUARD,XR(H)::QAR2(B)
- P(a);::QAB1(B)
- P(d);SBLOCK::QAB(B)
- R(c);SBLOCK::S(C)
- R(c);N_GUARD::QAR2(B)
- S(e);SBLOCK::S(G)
- Refutation
- R(c);
- Try
- Q(B);CHECK
- Vars
- K(b);P-FLIGHT::QAR1(B)
- Refutation
- K(b);S_FLIGHT
- Try
- Q(B);CHECK
- Vars
- K(b);P-FLIGHT::QAR1(B)
- Refutation
- K(b);S_FLIGHT
- Try
- Actual
- R(H);
- Vars
- R(c);CHECK,N_GUARD::QAR2(B),XR(c)
- R(c);N_GUARD,XS(C)::QAR2(B)
- P(a);::QAB1(B)
- P(d);SBLOCK::QAB(B)
- S(e);N_GUARD::R(F)
- R(c);SBLOCK::S(C)
- R(c);OGATEB::R(H),XR(c)
- R(c);N_GUARD::QAR2(B)
- S(e);SBLOCK::B(D)
- S(e);SBLOCK::S(G)
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