MESON Chess Problem Database
Problem Display
PID: 207831 (2N5/3B4/p7/p1pk4/Q4P2/2P1P1p1/K2n2R1/2Br4 w - - 0 1)
Sumner, Christopher Richard Benson
The Observer, 1954
(First published on Sun Oct 24 1954)
#2
9 + 7
| 15239 | Valois Notebooks | 2020 |
| 5454 | Near Snap | 2022 |
SOLUTION
- SOUND
- Sets
- 1...Rxc1
- 2.Rxd2#
- 1...Re1
- 2.Rxd2#
- 1...Rf1
- 2.Rxd2#
- 1...Rg1
- 2.Rxd2#
- 1...Rh1
- 2.Rxd2#
- 1...Sb1
- 2.e4#
- 1...Sf1
- 2.e4#
- 1...Sb3
- 2.e4#
- 1...Sf3
- 2.e4#
- 1...Sc4
- 2.Qc6#
- 1...Se4
- 2.c4#
- 1...c4
- 2.Qc6#
- 1...Rxc1
- Tries
- 1.Kb2?
- 1...Rxc1
- 2.Rxd2#
- 1...c4
- 2.Qc6#
- 1...Re1
- 2.Rxd2#
- 1...Rf1
- 2.Rxd2#
- 1...Rg1
- 2.Rxd2#
- 1...Rh1
- 2.Rxd2#
- 1...Sb1
- 2.e4#
- 1...Sf1
- 2.e4#
- 1...Sb3
- 2.e4#
- 1...Sf3
- 2.e4#
- 1...Se4
- 2.c4#
- 1...Sc4+!
- 1...Rxc1
- 1.Bb2?
- 1...Sc4
- 2.Qc6#
- 1...c4
- 2.Qc6#
- 1...Rb1
- 2.Rxd2#
- 1...Rc1
- 2.Rxd2#
- 1...Re1
- 2.Rxd2#
- 1...Rf1
- 2.Rxd2#
- 1...Rg1
- 2.Rxd2#
- 1...Rh1
- 2.Rxd2#
- 1...Sb1
- 2.e4#
- 1...Sf1
- 2.e4#
- 1...Sb3
- 2.e4#
- 1...Sf3
- 2.e4#
- 1...Se4
- 2.c4#
- 1...Ra1+!
- 1...Sc4
- 1.Ba3?
- 1...Sc4
- 2.Qc6#
- 1...c4
- 2.Qc6#
- 1...Rb1
- 2.Rxd2#
- 1...Rc1
- 2.Rxd2#
- 1...Re1
- 2.Rxd2#
- 1...Rf1
- 2.Rxd2#
- 1...Rg1
- 2.Rxd2#
- 1...Rh1
- 2.Rxd2#
- 1...Sb1
- 2.e4#
- 1...Sf1
- 2.e4#
- 1...Sb3
- 2.e4#
- 1...Sf3
- 2.e4#
- 1...Se4
- 2.c4#
- 1...Ra1+!
- 1...Sc4
- 1.Bf5?
- 1...Rxc1
- 2.Rxd2#
- 1...Re1
- 2.Rxd2#
- 1...Rf1
- 2.Rxd2#
- 1...Rg1
- 2.Rxd2#
- 1...Rh1
- 2.Rxd2#
- 1...Sb1
- 2.Qe4#
- 2.c4#
- 2.e4#
- 1...Sf1
- 2.Qe4#
- 2.c4#
- 2.e4#
- 1...Sb3
- 2.Qe4#
- 2.c4#
- 2.e4#
- 1...Sf3
- 2.Qe4#
- 2.c4#
- 2.e4#
- 1...Sc4
- 2.e4#
- 1...Se4
- 2.Qxe4#
- 2.c4#
- 1...c4!
- 1...Rxc1
- 1.Be8?
- threat
- 2.Bf7#
- 1...Sc4
- 2.Qc6#
- 1...c4
- 2.Qc6#
- 1...Ke6!
- threat
- 1.Re2?
- 1...Rxc1
- 2.Rxd2#
- 1...Sc4
- 2.Qc6#
- 2.e4#
- 1...c4
- 2.Qc6#
- 1...Re1
- 2.Rxd2#
- 1...Rf1
- 2.Rxd2#
- 1...Rg1
- 2.Rxd2#
- 1...Rh1
- 2.Rxd2#
- 1...Sb1
- 2.e4#
- 1...Sf1
- 2.e4#
- 1...Sb3
- 2.e4#
- 1...Sf3
- 2.e4#
- 1...Se4
- 2.c4#
- 1...g2!
- 1...Rxc1
- 1.Rh2?
- threat
- 2.Rh5#
- 1...Sc4
- 2.Qc6#
- 1...c4
- 2.Qc6#
- 1...Rh1
- 2.Rxd2#
- 1...Sf3
- 2.e4#
- 1...Se4
- 2.c4#
- 1...gxh2!
- threat
- 1.Rxg3?
- threat
- 2.Rg5#
- 1...Sc4
- 2.Qc6#
- 1...c4
- 2.Qc6#
- 1...Sf3
- 2.e4#
- 1...Se4
- 2.c4#
- 1...Rg1!
- threat
- 1.c4+?
- 1...Sxc4
- 2.Qc6#
- 1...Ke4!
- 1...Sxc4
- 1.Kb2?
- Keys
- 1.Qc2!
- threat
- 2.Qd3#
- 1...Kc4
- 2.Sb6#
- 1...Sb1
- 2.c4#
- 1...Sf1
- 2.c4#
- 1...Sb3
- 2.c4#
- 1...Sf3
- 2.c4#
- 1...Sc4
- 2.e4#
- 1...Se4
- 2.c4#
- 1...c4
- 2.Qf5#
- threat
- 1.Qc2!
Anticipated by 231259(1927)
FEATURES
- Static
- TYPE = BLOCK_THREAT
- CHANGED MATES = 6
- ADDED MATES = 1
- REMOVED MATES = 5
- Sets
- R(a);N_GUARD,XB(A)::R(C),XS(b)
- R(a);N_GUARD::R(C),XS(b)
- S(b);N_GUARD::P(E)
- S(b);SBLOCK::QAB1(F)
- S(b);N_GUARD,SBLOCK::P(D)
- P(e);::QAB1(F)
- Tries
- Try
- K(B);P-FLIGHT
- Vars
- R(a);N_GUARD,XB(A)::R(C),XS(b)
- P(e);::QAB1(F)
- R(a);N_GUARD::R(C),XS(b)
- S(b);N_GUARD::P(E)
- S(b);N_GUARD,SBLOCK::P(D)
- Refutation
- S(b);CHECK
- Try
- B(A);
- Vars
- S(b);SBLOCK::QAB1(F)
- P(e);::QAB1(F)
- R(a);N_GUARD::R(C),XS(b)
- S(b);N_GUARD::P(E)
- S(b);N_GUARD,SBLOCK::P(D)
- Refutation
- R(a);CHECK
- Try
- B(A);
- Vars
- S(b);SBLOCK::QAB1(F)
- P(e);::QAB1(F)
- R(a);N_GUARD::R(C),XS(b)
- S(b);N_GUARD::P(E)
- S(b);N_GUARD,SBLOCK::P(D)
- Refutation
- R(a);CHECK
- Try
- B(H);
- Vars
- R(a);N_GUARD,XB(A)::R(C),XS(b)
- R(a);N_GUARD::R(C),XS(b)
- S(b);N_GUARD::P(E)
- Refutation
- P(e);
- Try
- B(H);
- Threat
- B(H)
- Vars
- S(b);SBLOCK::QAB1(F)
- P(e);::QAB1(F)
- Refutation
- K(f);S_FLIGHT
- Try
- R(C);
- Vars
- R(a);N_GUARD,XB(A)::R(C),XS(b)
- P(e);::QAB1(F)
- R(a);N_GUARD::R(C),XS(b)
- S(b);N_GUARD::P(E)
- S(b);N_GUARD,SBLOCK::P(D)
- Refutation
- P(c);
- Try
- R(C);
- Threat
- R(C)
- Vars
- S(b);SBLOCK::QAB1(F)
- P(e);::QAB1(F)
- R(a);N_GUARD::R(C),XS(b)
- S(b);N_GUARD::P(E)
- S(b);N_GUARD,SBLOCK::P(D)
- Refutation
- P(c);XR(C)
- Try
- R(C);XP(c)
- Threat
- R(C)
- Vars
- S(b);SBLOCK::QAB1(F)
- P(e);::QAB1(F)
- S(b);N_GUARD::P(E)
- S(b);N_GUARD,SBLOCK::P(D)
- Refutation
- R(a);
- Try
- P(D);CHECK
- Vars
- S(b);SBLOCK,XP(D)::QAB1(F)
- Refutation
- K(f);S_FLIGHT
- Try
- Actual
- Q(F);
- Threat
- QAR2(F)
- Vars
- K(f);S_FLIGHT::S(I)
- S(b);N_GUARD::P(D)
- S(b);N_GUARD,SBLOCK::P(E)
- P(e);SBLOCK::QAR2(F)
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