MESON Chess Problem Database
Problem Display
PID: 163883 (8/3n2pB/N5N1/3p4/1Q1pk1P1/4p1P1/6K1/6B1 w - - 0 1)
Sumner, Christopher Richard Benson
The Observer, 1925
(First published on Sun Nov 29 1925)
#2
8 + 6
| 15239 | Valois Notebooks | 2017 |
SOLUTION
- SOUND
- Sets
- 1...Kd3
- 2.Sf4#
- 1...Sc5
- 2.Sxc5#
- 1...Se5
- 2.Sc5#
- 1...Sb6
- 2.Sc5#
- 1...Sf6
- 2.Sc5#
- 1...Sb8
- 2.Sc5#
- 1...Sf8
- 2.Sc5#
- 1...e2
- 2.Qxd4#
- 1...Kd3
- Tries
- 1.Sf4+?
- 1...Ke5
- 2.Qe7#
- 1...g6!
- 1...Ke5
- 1.Sh4+?
- 1...Ke5
- 2.Qe7#
- 1...g6!
- 1...Ke5
- 1.Se5+?
- 1...Kxe5
- 2.Qe7#
- 1...g6!
- 1...Kxe5
- 1.Sf8+?
- 1...Ke5
- 2.Qe7#
- 1...g6!
- 1...Ke5
- 1.Sh8+?
- 1...Ke5
- 2.Qe7#
- 1...g6!
- 1...Ke5
- 1.Bf2?
- 1...Kd3
- 2.Sf4#
- 1...Sc5
- 2.Sxc5#
- 1...Se5
- 2.Sc5#
- 1...Sb6
- 2.Sc5#
- 1...Sf6
- 2.Sc5#
- 1...Sb8
- 2.Sc5#
- 1...Sf8
- 2.Sc5#
- 1...e2
- 2.Qxd4#
- 1...exf2!
- 1...Kd3
- 1.Bh2?
- 1...Kd3
- 2.Sf4#
- 1...Sc5
- 2.Sxc5#
- 1...Se5
- 2.Sc5#
- 1...Sb6
- 2.Sc5#
- 1...Sf6
- 2.Sc5#
- 1...Sb8
- 2.Sc5#
- 1...Sf8
- 2.Sc5#
- 1...e2!
- 1...Kd3
- 1.Bg8?
- 1...Sc5
- 2.Sxc5#
- 1...Se5
- 2.Sc5#
- 1...Sb6
- 2.Sc5#
- 1...Sf6
- 2.Sc5#
- 1...Sb8
- 2.Sc5#
- 1...Sf8
- 2.Sc5#
- 1...e2
- 2.Qxd4#
- 1...Kd3!
- 1...Sc5
- 1.Qd2?
- 1...d3
- 2.Qxe3#
- 1...Sc5
- 2.Sxc5#
- 1...Se5
- 2.Sc5#
- 1...Sb6
- 2.Sc5#
- 1...Sf6
- 2.Sc5#
- 1...Sb8
- 2.Sc5#
- 1...Sf8
- 2.Sc5#
- 1...e2
- 2.Qxe2#
- 2.Qxd4#
- 1...exd2!
- 1...d3
- 1.Qa3?
- 1...Sc5
- 2.Sxc5#
- 1...Se5
- 2.Sc5#
- 1...Sb6
- 2.Sc5#
- 1...Sf6
- 2.Sc5#
- 1...Sb8
- 2.Sc5#
- 1...Sf8
- 2.Sc5#
- 1...e2
- 2.Qf3#
- 1...d3!
- 1...Sc5
- 1.Qe7+?
- 1...Se5
- 2.Sc5#
- 1...Kd3!
- 1...Se5
- 1.Qf8?
- threat
- 2.Qf5#
- 1...Sxf8
- 2.Sc5#
- 1...Sf6
- 2.Sc5#
- 1...d3
- 2.Qf4#
- 1...Kd3!
- threat
- 1.Qb2?
- 1...Kd3
- 2.Se5#
- 1...Sc5
- 2.Sxc5#
- 1...Se5
- 2.Sc5#
- 1...Sb6
- 2.Sc5#
- 1...Sf6
- 2.Sc5#
- 1...Sb8
- 2.Sc5#
- 1...Sf8
- 2.Sc5#
- 1...e2
- 2.Qxd4#
- 2.Qxe2#
- 1...d3!
- 1...Kd3
- 1.Qb3?
- 1...Sc5
- 2.Sxc5#
- 1...Se5
- 2.Sc5#
- 1...Sb6
- 2.Sc5#
- 1...Sf6
- 2.Sc5#
- 1...Sb8
- 2.Sc5#
- 1...Sf8
- 2.Sc5#
- 1...e2
- 2.Qf3#
- 1...d3!
- 1...Sc5
- 1.Qa4?
- 1...Sc5
- 2.Sxc5#
- 1...Se5
- 2.Sc5#
- 1...Sb6
- 2.Sc5#
- 1...Sf6
- 2.Sc5#
- 1...Sb8
- 2.Sc5#
- 1...Sf8
- 2.Sc5#
- 1...e2
- 2.Qxd4#
- 1...Kd3!
- 1...Sc5
- 1.Qc4?
- 1...Sc5
- 2.Sxc5#
- 1...Se5
- 2.Sc5#
- 1...Sb6
- 2.Sc5#
- 1...Sf6
- 2.Sc5#
- 1...Sb8
- 2.Sc5#
- 1...Sf8
- 2.Sc5#
- 1...e2
- 2.Qxe2#
- 2.Qxd4#
- 1...dxc4!
- 1...Sc5
- 1.Qb5?
- 1...Sc5
- 2.Sxc5#
- 1...Se5
- 2.Sc5#
- 1...Sb6
- 2.Sc5#
- 1...Sf6
- 2.Sc5#
- 1...Sb8
- 2.Sc5#
- 1...Sf8
- 2.Sc5#
- 1...e2
- 2.Qxe2#
- 1...d3!
- 1...Sc5
- 1.Qb6?
- 1...Sxb6
- 2.Sc5#
- 1...Sc5
- 2.Sxc5#
- 1...Se5
- 2.Sc5#
- 1...Sf6
- 2.Sc5#
- 1...Sb8
- 2.Sc5#
- 1...Sf8
- 2.Sc5#
- 1...e2
- 2.Qxd4#
- 1...d3
- 2.Qxe3#
- 1...Kd3!
- 1...Sxb6
- 1.Sf4+?
- Keys
- 1.Qe1!
- 1...Kd3
- 2.Se5#
- 1...Sc5
- 2.Sxc5#
- 1...Se5
- 2.Sc5#
- 1...Sb6
- 2.Sc5#
- 1...Sf6
- 2.Sc5#
- 1...Sb8
- 2.Sc5#
- 1...Sf8
- 2.Sc5#
- 1...e2
- 2.Qxe2#
- 1...d3
- 2.Qxe3#
- 1...Kd3
- 1.Qe1!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 2
- ADDED MATES = 1
- REMOVED MATES = 0
- Sets
- K(c);N_SPINP(b),S_FLIGHT::B(H)+S(G),DCHECK
- S(e);N_GUARD::S(F),XS(e)
- S(e);N_GUARD::S(F)
- P(a);::QAR1(D),XP(b)
- Tries
- Try
- S(G);CHECK
- Vars
- K(c);N_SPINP(b),P-FLIGHT::QAR2(D)
- Refutation
- P(f);
- Try
- S(G);CHECK
- Vars
- K(c);N_SPINP(b),P-FLIGHT::QAR2(D)
- Refutation
- P(f);
- Try
- S(G);CHECK
- Vars
- K(c);N_SPINP(b),P-FLIGHT,XS(G)::QAR2(D)
- Refutation
- P(f);
- Try
- S(G);CHECK
- Vars
- K(c);N_SPINP(b),P-FLIGHT::QAR2(D)
- Refutation
- P(f);
- Try
- S(G);CHECK
- Vars
- K(c);N_SPINP(b),P-FLIGHT::QAR2(D)
- Refutation
- P(f);
- Try
- B(A);
- Vars
- K(c);N_SPINP(b),S_FLIGHT::B(H)+S(G),DCHECK
- S(e);N_GUARD::S(F),XS(e)
- S(e);N_GUARD::S(F)
- P(a);::QAR1(D),XP(b)
- Refutation
- P(a);XB(A)
- Try
- B(A);
- Vars
- K(c);N_SPINP(b),S_FLIGHT::B(H)+S(G),DCHECK
- S(e);N_GUARD::S(F),XS(e)
- S(e);N_GUARD::S(F)
- Refutation
- P(a);
- Try
- B(H);
- Vars
- S(e);N_GUARD::S(F),XS(e)
- S(e);N_GUARD::S(F)
- P(a);::QAR1(D),XP(b)
- Refutation
- K(c);N_SPINP(b),S_FLIGHT
- Try
- Q(D);N_PINP(b)
- Vars
- P(b);N_GUARD::QAR1(D),XP(a)
- S(e);N_GUARD::S(F),XS(e)
- S(e);N_GUARD::S(F)
- Refutation
- P(a);XQ(D)
- Try
- Q(D);N_PINP(b)
- Vars
- S(e);N_GUARD::S(F),XS(e)
- S(e);N_GUARD::S(F)
- P(a);OGATE::QAB1(D)
- Refutation
- P(b);
- Try
- Q(D);CHECK,N_PINP(b)
- Vars
- S(e);P_SPINS(e)::S(F)
- Refutation
- K(c);S_FLIGHT
- Try
- Q(D);N_PINP(b)
- Threat
- QAB1(D)
- Vars
- S(e);N_GUARD,XQ(D)::S(F)
- S(e);N_GUARD::S(F)
- P(b);SBLOCK::QAR1(D)
- Refutation
- K(c);S_FLIGHT
- Try
- Q(D);N_PINP(b)
- Vars
- K(c);S_FLIGHT::B(H)+S(G),DCHECK
- S(e);N_GUARD::S(F),XS(e)
- S(e);N_GUARD::S(F)
- Refutation
- P(b);
- Try
- Q(D);N_PINP(b)
- Vars
- S(e);N_GUARD::S(F),XS(e)
- S(e);N_GUARD::S(F)
- P(a);OGATE::QAB1(D)
- Refutation
- P(b);
- Try
- Q(D);
- Vars
- S(e);N_GUARD::S(F),XS(e)
- S(e);N_GUARD::S(F)
- P(a);::QAR1(D),XP(b)
- Refutation
- K(c);N_SPINP(b),S_FLIGHT
- Try
- Q(D);
- Vars
- S(e);N_GUARD::S(F),XS(e)
- S(e);N_GUARD::S(F)
- Refutation
- P(d);N_SPINP(b),XQ(D)
- Try
- Q(D);N_PINP(b)
- Vars
- S(e);N_GUARD::S(F),XS(e)
- S(e);N_GUARD::S(F)
- P(a);OGATEB::QAR2(D),XP(a)
- Refutation
- P(b);
- Try
- Q(D);N_PINP(b)
- Vars
- S(e);N_GUARD,XQ(D)::S(F)
- S(e);N_GUARD::S(F),XS(e)
- S(e);N_GUARD::S(F)
- P(a);::QAR1(D),XP(b)
- P(b);OGATE::QAR1(D),XP(a)
- Refutation
- K(c);S_FLIGHT
- Try
- Actual
- Q(D);N_PINP(b),P_PINP(a)
- Vars
- K(c);N_SPINP(a),S_FLIGHT::B(H)+S(G),DCHECK
- S(e);N_GUARD::S(F),XS(e)
- S(e);N_GUARD::S(F)
- P(a);OGATEB::QAR2(D),XP(a)
- P(b);N_GUARD::QAR1(D),XP(a)
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