MESON Chess Problem Database
Problem Display
PID: 163596 (8/8/8/3B4/1p1pp3/1P1k1n2/1QNn4/3K4 w - - 0 1)
Sumner, Christopher Richard Benson
The Observer, 1925
(First published on Sun Sep 6 1925)
#2
5 + 6
| 15239 | Valois Notebooks | 2017 |
SOLUTION
- SOUND
- Sets
- 1...Sb1
- 2.Bc4#
- 1...Sf1
- 2.Bc4#
- 1...Sxb3
- 2.Qxb3#
- 1...Sc4
- 2.Bxc4#
- 1...Se1
- 2.Qxd4#
- 1...Sg1
- 2.Qxd4#
- 1...Sh2
- 2.Qxd4#
- 1...Sh4
- 2.Qxd4#
- 1...Se5
- 2.Qxd4#
- 1...Sg5
- 2.Qxd4#
- 1...e3
- 2.Sxb4#
- 1...Sb1
- Tries
- 1.Se1+?
- 1...Sxe1
- 2.Qxd2#
- 1...Ke3!
- 1...Sxe1
- 1.Bc6?
- 1...Sxb3
- 2.Bb5#
- 2.Qxb3#
- 1...Sb1
- 2.Bb5#
- 1...Sf1
- 2.Bb5#
- 1...Se1
- 2.Qxd4#
- 1...Sg1
- 2.Qxd4#
- 1...Sh2
- 2.Qxd4#
- 1...Sh4
- 2.Qxd4#
- 1...Se5
- 2.Qxd4#
- 1...Sg5
- 2.Qxd4#
- 1...e3
- 2.Sxb4#
- 1...Sc4!
- 1...Sxb3
- 1.Be6?
- 1...Sxb3
- 2.Qxb3#
- 1...Sb1
- 2.Bc4#
- 1...Sf1
- 2.Bc4#
- 1...Sc4
- 2.Bxc4#
- 1...Se1
- 2.Qxd4#
- 1...Sg1
- 2.Qxd4#
- 1...Sh2
- 2.Qxd4#
- 1...Sh4
- 2.Qxd4#
- 1...Se5
- 2.Qxd4#
- 1...Sg5
- 2.Qxd4#
- 1...e3!
- 1...Sxb3
- 1.Bb7?
- 1...Sxb3
- 2.Ba6#
- 2.Qxb3#
- 1...Sb1
- 2.Ba6#
- 1...Sf1
- 2.Ba6#
- 1...Se1
- 2.Qxd4#
- 1...Sg1
- 2.Qxd4#
- 1...Sh2
- 2.Qxd4#
- 1...Sh4
- 2.Qxd4#
- 1...Se5
- 2.Qxd4#
- 1...Sg5
- 2.Qxd4#
- 1...e3
- 2.Sxb4#
- 1...Sc4!
- 1...Sxb3
- 1.Bf7?
- 1...Sxb3
- 2.Qxb3#
- 1...Sc4
- 2.Bxc4#
- 1...Sb1
- 2.Bc4#
- 1...Sf1
- 2.Bc4#
- 1...Se1
- 2.Qxd4#
- 1...Sg1
- 2.Qxd4#
- 1...Sh2
- 2.Qxd4#
- 1...Sh4
- 2.Qxd4#
- 1...Se5
- 2.Qxd4#
- 1...Sg5
- 2.Qxd4#
- 1...e3!
- 1...Sxb3
- 1.Bg8?
- 1...Sxb3
- 2.Qxb3#
- 1...Sc4
- 2.Bxc4#
- 1...Sb1
- 2.Bc4#
- 1...Sf1
- 2.Bc4#
- 1...Se1
- 2.Qxd4#
- 1...Sg1
- 2.Qxd4#
- 1...Sh2
- 2.Qxd4#
- 1...Sh4
- 2.Qxd4#
- 1...Se5
- 2.Qxd4#
- 1...Sg5
- 2.Qxd4#
- 1...e3!
- 1...Sxb3
- 1.Qa1?
- 1...Sc4
- 2.Bxc4#
- 1...Sb1
- 2.Bc4#
- 1...Sf1
- 2.Bc4#
- 1...Se1
- 2.Qxd4#
- 1...Sg1
- 2.Qxd4#
- 1...Sh2
- 2.Qxd4#
- 1...Sh4
- 2.Qxd4#
- 1...Se5
- 2.Qxd4#
- 1...Sg5
- 2.Qxd4#
- 1...e3
- 2.Sxb4#
- 1...Sxb3!
- 1...Sc4
- 1.Se1+?
- Keys
- 1.Qc1!
- 1...Kc3
- 2.Se1#
- 1...Sxb3
- 2.Sxb4#
- 1...Sc4
- 2.Sxb4#
- 1...Sb1
- 2.Sxb4#
- 1...Sf1
- 2.Sxb4#
- 1...Se1
- 2.Qxd2#
- 1...Sg1
- 2.Qxd2#
- 1...Sh2
- 2.Qxd2#
- 1...Sh4
- 2.Qxd2#
- 1...Se5
- 2.Qxd2#
- 1...Sg5
- 2.Qxd2#
- 1...e3
- 2.Sxb4#
- 1...Kc3
- 1.Qc1!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 10
- ADDED MATES = 1
- REMOVED MATES = 0
- Sets
- S(a);N_GUARD::B(E)
- S(a);OGATE,XP(D)::QAR2(B),XS(a)
- S(a);N_GUARD::B(E),XS(a)
- S(c);N_GUARD::QAR1(B),XP(e)
- P(f);SBLOCK::S(C),XP(d)
- Tries
- Try
- S(C);CHECK
- Vars
- S(c);XS(C)::QAR1(B),XS(a)
- Refutation
- K(b);P-FLIGHT
- Try
- B(E);
- Vars
- S(a);N_GUARD::B(E)
- S(c);N_GUARD::QAR1(B),XP(e)
- P(f);SBLOCK::S(C),XP(d)
- Refutation
- S(a);
- Try
- B(E);
- Vars
- S(a);OGATE,XP(D)::QAR2(B),XS(a)
- S(a);N_GUARD::B(E)
- S(a);N_GUARD::B(E),XS(a)
- S(c);N_GUARD::QAR1(B),XP(e)
- Refutation
- P(f);
- Try
- B(E);
- Vars
- S(a);N_GUARD::B(E)
- S(c);N_GUARD::QAR1(B),XP(e)
- P(f);SBLOCK::S(C),XP(d)
- Refutation
- S(a);
- Try
- B(E);
- Vars
- S(a);OGATE,XP(D)::QAR2(B),XS(a)
- S(a);N_GUARD::B(E),XS(a)
- S(a);N_GUARD::B(E)
- S(c);N_GUARD::QAR1(B),XP(e)
- Refutation
- P(f);
- Try
- B(E);
- Vars
- S(a);OGATE,XP(D)::QAR2(B),XS(a)
- S(a);N_GUARD::B(E),XS(a)
- S(a);N_GUARD::B(E)
- S(c);N_GUARD::QAR1(B),XP(e)
- Refutation
- P(f);
- Try
- Q(B);
- Vars
- S(a);N_GUARD::B(E),XS(a)
- S(a);N_GUARD::B(E)
- S(c);N_GUARD::QAR1(B),XP(e)
- P(f);SBLOCK::S(C),XP(d)
- Refutation
- S(a);XP(D)
- Try
- Actual
- Q(B);
- Vars
- K(b);P-FLIGHT::QAR(B)+S(C)
- S(a);XP(D)::S(C),XP(d)
- S(a);::S(C),XP(d)
- S(c);N_GUARD::QAR1(B),XS(a)
- P(f);SBLOCK::S(C),XP(d)
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