MESON Chess Problem Database
Problem Display
PID: 199507 (4N3/n3p3/4p3/1p2k2n/1P1bP3/8/2BK2N1/B4Q2 w - - 0 1)
Meurs, Abraham
The Observer, 1945
(First published on Sun Oct 21 1945)
#2
8 + 7
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Bxa1
- 2.Qxa1#
- 1...Bb2
- 2.Bxb2#
- 1...Bc3+
- 2.Bxc3#
- 1...Sg3
- 2.Qf4#
- 1...Sf4
- 2.Qxf4#
- 1...Sf6
- 2.Qf4#
- 1...Sg7
- 2.Qf4#
- 1...Sc6
- 2.Qxb5#
- 1...Sc8
- 2.Qxb5#
- 1...Bxa1
- Tries
- 1.Kc1?
- 1...Bb2+
- 2.Bxb2#
- 1...Bc3
- 2.Bxc3#
- 1...Sg3
- 2.Qf4#
- 1...Sf4
- 2.Qxf4#
- 1...Sf6
- 2.Qf4#
- 1...Sg7
- 2.Qf4#
- 1...Sc6
- 2.Qxb5#
- 1...Sc8
- 2.Qxb5#
- 1...Bxa1!
- 1...Bb2+
- 1.Kd1?
- 1...Bb2
- 2.Bxb2#
- 1...Bc3
- 2.Bxc3#
- 1...Sg3
- 2.Qf4#
- 1...Sf4
- 2.Qxf4#
- 1...Sf6
- 2.Qf4#
- 1...Sg7
- 2.Qf4#
- 1...Sc6
- 2.Qxb5#
- 1...Sc8
- 2.Qxb5#
- 1...Bxa1!
- 1...Bb2
- 1.Ke1?
- 1...Bc3+
- 2.Bxc3#
- 1...Bb2
- 2.Bxb2#
- 1...Sg3
- 2.Qf4#
- 1...Sf4
- 2.Qxf4#
- 1...Sf6
- 2.Qf4#
- 1...Sg7
- 2.Qf4#
- 1...Sc6
- 2.Qxb5#
- 1...Sc8
- 2.Qxb5#
- 1...Bxa1!
- 1...Bc3+
- 1.Kd3?
- threat
- 2.Bxd4#
- 1...Sf4+
- 2.Qxf4#
- 1...Bxa1
- 2.Qxa1#
- 1...Bb2
- 2.Bxb2#
- 1...Bc3
- 2.Bxc3#
- 1...Sc6!
- threat
- 1.Sh4?
- threat
- 2.Sg6#
- 1...Bc3+
- 2.Bxc3#
- 1...Bb2
- 2.Bxb2#
- 1...Sf4
- 2.Sf3#
- 1...Bxa1!
- threat
- 1.Bb2?
- 1...Bc3+
- 2.Bxc3#
- 1...Sc6
- 2.Qxb5#
- 1...Sg3
- 2.Qf4#
- 1...Sf4
- 2.Qxf4#
- 1...Sf6
- 2.Qf4#
- 1...Sg7
- 2.Qf4#
- 1...Sc8
- 2.Qxb5#
- 1...Bxb2!
- 1...Bc3+
- 1.Bc3?
- 1...Sc6
- 2.Qxb5#
- 1...Sg3
- 2.Qf4#
- 1...Sf4
- 2.Qxf4#
- 1...Sf6
- 2.Qf4#
- 1...Sg7
- 2.Qf4#
- 1...Sc8
- 2.Qxb5#
- 1...Bxc3+!
- 1...Sc6
- 1.Bb1?
- 1...Bc3+
- 2.Bxc3#
- 1...Bb2
- 2.Bxb2#
- 1...Sc6
- 2.Qxb5#
- 1...Sg3
- 2.Qf4#
- 1...Sf4
- 2.Qxf4#
- 1...Sf6
- 2.Qf4#
- 1...Sg7
- 2.Qf4#
- 1...Sc8
- 2.Qxb5#
- 1...Bxa1!
- 1...Bc3+
- 1.Qd3?
- threat
- 2.Bxd4#
- 2.Qxd4#
- 1...Bc3+
- 2.Bxc3#
- 2.Qxc3#
- 1...Sc6
- 2.Qxb5#
- 1...Bb2
- 2.Bxb2#
- 1...Bxa1!
- threat
- 1.Qc4?
- threat
- 2.Bxd4#
- 2.Qxd4#
- 2.Qc5#
- 2.Qc7#
- 1...Bc3+
- 2.Bxc3#
- 2.Qxc3#
- 1...Bxa1
- 2.Qc5#
- 1...Sc6
- 2.Qxb5#
- 2.Qc5#
- 1...Bb2
- 2.Bxb2#
- 2.Qc5#
- 1...Sf4
- 2.Bxd4#
- 2.Qxd4#
- 2.Qc7#
- 1...Sf6
- 2.Bxd4#
- 2.Qxd4#
- 2.Qc7#
- 1...Sc8
- 2.Bxd4#
- 2.Qxb5#
- 2.Qxd4#
- 2.Qc5#
- 1...bxc4!
- threat
- 1.Qg1?
- threat
- 2.Bxd4#
- 2.Qxd4#
- 1...Bc3+
- 2.Bxc3#
- 1...Bxa1
- 2.Qc5#
- 2.Qxa1#
- 1...Bb2
- 2.Bxb2#
- 2.Qc5#
- 1...Sc6!
- threat
- 1.Qf2?
- threat
- 2.Bxd4#
- 2.Qxd4#
- 1...Bc3+
- 2.Bxc3#
- 1...Bxa1
- 2.Qc5#
- 1...Bb2
- 2.Bxb2#
- 2.Qc5#
- 1...Sc6!
- threat
- 1.Qf3?
- threat
- 2.Qxh5#
- 1...Bc3+
- 2.Bxc3#
- 2.Qxc3#
- 1...Bb2
- 2.Bxb2#
- 1...Sg3
- 2.Qxg3#
- 2.Qf4#
- 1...Sf4
- 2.Qxf4#
- 1...Sf6
- 2.Qg3#
- 2.Qf4#
- 1...Sg7
- 2.Qg3#
- 2.Qf4#
- 1...Bxa1!
- threat
- 1.Kc1?
- Keys
- 1.Qh1!
- threat
- 2.Qxh5#
- 1...Bc3+
- 2.Bxc3#
- 1...Bxa1
- 2.Qxa1#
- 1...Bb2
- 2.Bxb2#
- 1...Sg3
- 2.Qh8#
- 1...Sf4
- 2.Qh8#
- 1...Sf6
- 2.Qh2#
- 1...Sg7
- 2.Qh2#
- threat
- 1.Qh1!
FEATURES
- Static
- TYPE = BLOCK_THREAT
- CHANGED MATES = 4
- ADDED MATES = 0
- REMOVED MATES = 2
- Sets
- B(a);N_SPINB(a),OGATE,XB(A)::QAB(B),XB(a)
- B(a);OGATEB::B(A),XB(a)
- B(a);CHECK,OGATEB::B(A),XB(a)
- S(d);N_GUARD::QAB1(B)
- S(d);N_GUARD::QAB1(B),XS(d)
- S(f);N_GUARD::QAR(B),XP(b)
- Tries
- Try
- K(D);S_FLIGHT
- Vars
- B(a);CHECK,OGATEB::B(A),XB(a)
- B(a);OGATEB::B(A),XB(a)
- S(d);N_GUARD::QAB1(B)
- S(d);N_GUARD::QAB1(B),XS(d)
- S(f);N_GUARD::QAR(B),XP(b)
- Refutation
- B(a);N_SPINB(a),XB(A)
- Try
- K(D);P-FLIGHT
- Vars
- B(a);OGATEB::B(A),XB(a)
- S(d);N_GUARD::QAB1(B)
- S(d);N_GUARD::QAB1(B),XS(d)
- S(f);N_GUARD::QAR(B),XP(b)
- Refutation
- B(a);N_SPINB(a),XB(A)
- Try
- K(D);S_FLIGHT
- Vars
- B(a);CHECK,OGATEB::B(A),XB(a)
- B(a);OGATEB::B(A),XB(a)
- S(d);N_GUARD::QAB1(B)
- S(d);N_GUARD::QAB1(B),XS(d)
- S(f);N_GUARD::QAR(B),XP(b)
- Refutation
- B(a);N_SPINB(a),XB(A)
- Try
- K(D);P-FLIGHT
- Threat
- B(A),XB(a)
- Vars
- S(d);CHECK,N_GUARD::QAB1(B),XS(d)
- B(a);N_SPINB(a),OGATE,XB(A)::QAB(B),XB(a)
- B(a);OGATEB::B(A),XB(a)
- Refutation
- S(f);
- Try
- S(E);
- Threat
- S(E)
- Vars
- B(a);CHECK,OGATEB::B(A),XB(a)
- B(a);OGATEB::B(A),XB(a)
- S(d);SBLOCK::S(E)
- Refutation
- B(a);N_SPINB(a),XB(A)
- Try
- B(A);
- Vars
- B(a);CHECK,OGATEB::B(A),XB(a)
- S(f);N_GUARD::QAR(B),XP(b)
- S(d);N_GUARD::QAB1(B)
- S(d);N_GUARD::QAB1(B),XS(d)
- Refutation
- B(a);N_SPINB(a),XB(A)
- Try
- B(A);
- Vars
- S(f);N_GUARD::QAR(B),XP(b)
- S(d);N_GUARD::QAB1(B)
- S(d);N_GUARD::QAB1(B),XS(d)
- Refutation
- B(a);CHECK,N_SPINB(a),XB(A)
- Try
- B(C);
- Vars
- B(a);CHECK,OGATEB::B(A),XB(a)
- B(a);OGATEB::B(A),XB(a)
- S(f);N_GUARD::QAR(B),XP(b)
- S(d);N_GUARD::QAB1(B)
- S(d);N_GUARD::QAB1(B),XS(d)
- Refutation
- B(a);N_SPINB(a),XB(A)
- Try
- Q(B);
- Threat
- DUALS(2)
- Vars
- S(f);N_GUARD::QAR(B),XP(b)
- B(a);OGATEB::B(A),XB(a)
- Refutation
- B(a);N_SPINB(a),XB(A)
- Try
- Q(B);
- Threat
- DUALS(4)
- Vars
- B(a);N_SPINB(a),XB(A)::QAR2(B)
- Refutation
- P(b);XQ(B)
- Try
- Q(B);
- Threat
- DUALS(2)
- Vars
- B(a);CHECK,OGATEB::B(A),XB(a)
- Refutation
- S(f);
- Try
- Q(B);
- Threat
- DUALS(2)
- Vars
- B(a);CHECK,OGATEB::B(A),XB(a)
- B(a);N_SPINB(a),OGATE,XB(A)::QAR2(B)
- Refutation
- S(f);
- Try
- Q(B);
- Threat
- QAR(B),XS(d)
- Vars
- B(a);OGATEB::B(A),XB(a)
- S(d);N_GUARD::QAB1(B),XS(d)
- Refutation
- B(a);N_SPINB(a),XB(A)
- Try
- Actual
- Q(B);
- Threat
- QAR(B),XS(d)
- Vars
- B(a);CHECK,OGATEB::B(A),XB(a)
- B(a);N_SPINB(a),OGATE,XB(A)::QAB(B),XB(a)
- B(a);OGATEB::B(A),XB(a)
- S(d);OGATE::QAB(B)
- S(d);N_GUARD::QAB(B)
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