MESON Chess Problem Database
Problem Display
PID: 164841 (3r4/2pn4/2Q3N1/5p2/1Ppk4/n4P2/BK1P4/2N5 w - - 0 1)
Sumner, Christopher Richard Benson
The Observer, 1926
(First published on Sun Dec 5 1926)
#2
8 + 7
| 15239 | Valois Notebooks | 2017 |
SOLUTION
- SOUND
- Sets
- 1...Ra8
- 2.Qxd7#
- 1...Rb8
- 2.Qxd7#
- 1...Rc8
- 2.Qxd7#
- 1...Re8
- 2.Qxd7#
- 1...Rf8
- 2.Qxd7#
- 1...Rg8
- 2.Qxd7#
- 1...Rh8
- 2.Qxd7#
- 1...Sb1
- 2.Qxc4#
- 1...Sc2
- 2.Qxc4#
- 1...Sb5
- 2.Qxc4#
- 1...Sc5
- 2.Qxc5#
- 1...Se5
- 2.Qc5#
- 1...Sb6
- 2.Qc5#
- 1...Sf6
- 2.Qc5#
- 1...Sb8
- 2.Qc5#
- 1...Sf8
- 2.Qc5#
- 1...c3+
- 2.Qxc3#
- 1...f4
- 2.Qe4#
- 1...Ra8
- Tries
- 1.Ka1?
- 1...Ra8
- 2.Qxd7#
- 1...Rb8
- 2.Qxd7#
- 1...Rc8
- 2.Qxd7#
- 1...Re8
- 2.Qxd7#
- 1...Rf8
- 2.Qxd7#
- 1...Rg8
- 2.Qxd7#
- 1...Rh8
- 2.Qxd7#
- 1...Sb1
- 2.Qxc4#
- 1...Sb5
- 2.Qxc4#
- 1...Sc5
- 2.Qxc5#
- 1...Se5
- 2.Qc5#
- 1...Sb6
- 2.Qc5#
- 1...Sf6
- 2.Qc5#
- 1...Sb8
- 2.Qc5#
- 1...Sf8
- 2.Qc5#
- 1...c3
- 2.Qd5#
- 2.Qxc3#
- 1...f4
- 2.Qe4#
- 1...Sc2+!
- 1...Ra8
- 1.Kxa3?
- threat
- 2.Qxc4#
- 1...Sc5
- 2.Qxc5#
- 1...Se5
- 2.Qc5#
- 1...Sb6
- 2.Qc5#
- 1...c3
- 2.Qd5#
- 2.Qxc3#
- 2.Qc4#
- 1...Ra8+!
- threat
- 1.Sb3+?
- 1...Kd3
- 2.Sf4#
- 1...cxb3!
- 1...Kd3
- 1.Sf4?
- threat
- 2.Qd5#
- 1...c3+
- 2.Qxc3#
- 1...Sc5
- 2.Qxc5#
- 2.Qf6#
- 1...Se5
- 2.Sce2#
- 2.Sfe2#
- 2.Se6#
- 2.Qc5#
- 1...Sb6
- 2.Qc5#
- 2.Qf6#
- 1...Sf6
- 2.Qc5#
- 2.Qxf6#
- 1...Sb8
- 2.Qc5#
- 2.Qf6#
- 1...Sf8
- 2.Qc5#
- 2.Qf6#
- 1...Ke5!
- threat
- 1.Se7?
- threat
- 2.Qd5#
- 1...c3+
- 2.Qxc3#
- 1...Sc5
- 2.Qxc5#
- 2.Qf6#
- 1...Se5
- 2.Sxf5#
- 2.Qc5#
- 1...Sb6
- 2.Qc5#
- 2.Qf6#
- 1...Sf6
- 2.Qc5#
- 2.Qxf6#
- 1...Sb8
- 2.Qc5#
- 2.Qf6#
- 1...Sf8
- 2.Qc5#
- 2.Qf6#
- 1...Ke5!
- threat
- 1.Bb3?
- 1...c3+
- 2.Qxc3#
- 1...Ra8
- 2.Qxd7#
- 1...Rb8
- 2.Qxd7#
- 1...Rc8
- 2.Qxd7#
- 1...Re8
- 2.Qxd7#
- 1...Rf8
- 2.Qxd7#
- 1...Rg8
- 2.Qxd7#
- 1...Rh8
- 2.Qxd7#
- 1...Sb1
- 2.Qxc4#
- 1...Sc2
- 2.Qxc4#
- 1...Sb5
- 2.Qxc4#
- 1...Sc5
- 2.Qxc5#
- 1...Se5
- 2.Qc5#
- 1...Sb6
- 2.Qc5#
- 1...Sf6
- 2.Qc5#
- 1...Sb8
- 2.Qc5#
- 1...Sf8
- 2.Qc5#
- 1...f4
- 2.Qe4#
- 1...cxb3!
- 1...c3+
- 1.Bxc4?
- threat
- 2.Se2#
- 2.Sb3#
- 2.Qd5#
- 1...Sc5
- 2.Qxc5#
- 1...Re8
- 2.Sb3#
- 2.Qd5#
- 1...Se5
- 2.Se2#
- 2.Sb3#
- 2.Qc5#
- 1...Sb6
- 2.Se2#
- 2.Sb3#
- 2.Qc5#
- 1...Sf6
- 2.Se2#
- 2.Sb3#
- 2.Qc5#
- 1...Sb8
- 2.Se2#
- 2.Sb3#
- 2.Qc5#
- 1...Sf8
- 2.Se2#
- 2.Sb3#
- 2.Qc5#
- 1...Sxc4+!
- threat
- 1.Qf6+?
- 1...Kd5
- 2.Sf4#
- 2.Se7#
- 1...Se5
- 2.Qxe5#
- 1...Sxf6!
- 1...Kd5
- 1.Qxc7?
- threat
- 2.Qd6#
- 1...c3+
- 2.Qxc3#
- 1...Sb5
- 2.Qxc4#
- 1...Sc5
- 2.Qe5#
- 2.Qxc5#
- 1...Se5
- 2.Qxe5#
- 2.Qc5#
- 1...Sb6
- 2.Qe5#
- 2.Qc5#
- 1...Sf6
- 2.Qe5#
- 2.Qc5#
- 1...Sb8
- 2.Qe5#
- 2.Qc5#
- 1...Sf8
- 2.Qe5#
- 2.Qc5#
- 1...Kd5!
- threat
- 1.Ka1?
- Keys
- 1.Qe6!
- 1...c3+
- 2.dxc3#
- 1...Ra8
- 2.Qxd7#
- 1...Rb8
- 2.Qxd7#
- 1...Rc8
- 2.Qxd7#
- 1...Re8
- 2.Qxd7#
- 1...Rf8
- 2.Qxd7#
- 1...Rg8
- 2.Qxd7#
- 1...Rh8
- 2.Qxd7#
- 1...Sb1
- 2.Qxc4#
- 1...Sc2
- 2.Qxc4#
- 1...Sb5
- 2.Qxc4#
- 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...f4
- 2.Qe4#
- 1...c5
- 2.Qd6#
- 1...c6
- 2.Qd6#
- 1...c3+
- 1.Qe6!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 7
- ADDED MATES = 2
- REMOVED MATES = 0
- Sets
- R(g);N_GUARD::QAR(G),XS(f)
- R(g);N_GUARD,P_PINP(F)::QAR(G),XS(f)
- S(a);N_GUARD::QAR1(G),XP(b)
- S(f);N_GUARD::QAB1(G),XS(f)
- S(f);N_GUARD::QAB1(G)
- P(b);CHECK,OGATE::QAB1(G),XP(b)
- P(d);N_GUARD::QAR1(G)
- Tries
- Try
- K(C);S_FLIGHT
- Vars
- R(g);N_GUARD::QAR(G),XS(f)
- S(a);N_GUARD::QAR1(G),XP(b)
- S(f);N_GUARD::QAB1(G),XS(f)
- S(f);N_GUARD::QAB1(G)
- P(d);N_GUARD::QAR1(G)
- Refutation
- S(a);CHECK
- Try
- K(C);S_FLIGHT,XS(a)
- Threat
- QAR1(G),XP(b)
- Vars
- S(f);N_GUARD::QAB1(G),XS(f)
- S(f);N_GUARD::QAB1(G)
- Refutation
- R(g);CHECK
- Try
- S(A);CHECK
- Vars
- K(c);P-FLIGHT::S(H)
- Refutation
- P(b);XS(A)
- Try
- S(H);
- Threat
- QAR1(G)
- Vars
- P(b);CHECK,OGATE::QAB1(G),XP(b)
- Refutation
- K(c);S_FLIGHT
- Try
- S(H);
- Threat
- QAR1(G)
- Vars
- P(b);CHECK,OGATE::QAB1(G),XP(b)
- Refutation
- K(c);S_FLIGHT
- Try
- B(B);
- Vars
- P(b);CHECK,OGATE::QAB1(G),XP(b)
- R(g);N_GUARD::QAR(G),XS(f)
- S(a);N_GUARD::QAR1(G),XP(b)
- S(f);N_GUARD::QAB1(G),XS(f)
- S(f);N_GUARD::QAB1(G)
- P(d);N_GUARD::QAR1(G)
- Refutation
- P(b);XB(B)
- Try
- B(B);XP(b)
- Threat
- DUALS(3)
- Vars
- S(f);N_GUARD::QAB1(G),XS(f)
- Refutation
- S(a);CHECK,XB(B)
- Try
- Q(G);CHECK
- Vars
- S(f);N_GUARD,P_SPINS(f)::QAB1(G),XS(f)
- Refutation
- S(f);XQ(G)
- Try
- Q(G);XP(e)
- Threat
- QAR2(G)
- Vars
- P(b);CHECK,OGATE::QAB1(G),XP(b)
- S(a);N_GUARD::QAR1(G),XP(b)
- Refutation
- K(c);P-FLIGHT,P_SPINP(b)
- Try
- Actual
- Q(G);
- Vars
- P(b);CHECK,OGATE::P(D),XP(b)
- R(g);N_GUARD::QAR(G),XS(f)
- R(g);N_GUARD,P_PINP(F)::QAR(G),XS(f)
- S(a);N_GUARD::QAR1(G),XP(b)
- S(f);N_GUARD::QAB1(G)
- S(f);N_GUARD::QAB1(G),XS(f)
- P(d);N_GUARD::QAR1(G)
- P(e);N_GUARD::QAR2(G)
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