Meson Chess Problem Database

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Problem Display

PID: 21883 (3r1b2/1Q4B1/N7/2pR1R2/4k3/7b/2nK4/8 w - - 0 1)

Larsen, Karl Adolf Koefoed

1st Prize, Sydsvenska Dagbladet Snallposten (Meredith Ty.), 1921

6 + 6

3310	2345 Chess Problems	1997

SOLUTION

SOUND
Sets
- 1...Rxd5+
  - 2.Qxd5#
- 1...Rd6
  - 2.Sxc5#
- 1...Ra8
  - 2.Rxc5#
- 1...Re8
  - 2.Rxc5#
- 1...Bxf5
  - 2.Rd4#
- 1...Bd6
  - 2.Rxc5#
- 1...Be7
  - 2.Qxe7#
- 1...Bxg7
  - 2.Sxc5#
- 1...Sd4
  - 2.Rde5#
Tries
- 1.Bxf8?
  - threat
    - 2.Sxc5#
    - 2.Qe7#
  - 1...Rxd5+
    - 2.Qxd5#
  - 1...Rd6
    - 2.Sxc5#
  - 1...Rd7
    - 2.Sxc5#
  - 1...Rc8
    - 2.Qe7#
  - 1...Re8
    - 2.Sxc5#
  - 1...Sd4
    - 2.Sxc5#
    - 2.Rde5#
  - 1...c4
    - 2.Sc5#
    - 2.Qe7#
  - 1...Bxf5!
- 1.Rd3+?
  - 1...Rd5
    - 2.Qxd5#
  - 1...Kxf5!
- 1.Rf2?
  - threat
    - 2.Rd4#
    - 2.Rd6#
    - 2.Rd7#
    - 2.Rxd8#
  - 1...Bxg7
    - 2.Sxc5#
  - 1...Rd7
    - 2.Rd4#
    - 2.Rxd7#
  - 1...Rd6
    - 2.Sxc5#
    - 2.Rd4#
    - 2.Rxd6#
  - 1...Ra8
    - 2.Rd3#
    - 2.Rd4#
    - 2.Rxc5#
    - 2.Rdf5#
    - 2.Rg5#
    - 2.Rh5#
    - 2.Rd6#
    - 2.Rd7#
    - 2.Rd8#
  - 1...Rb8
    - 2.Rd4#
  - 1...Rc8
    - 2.Rd4#
  - 1...Re8
    - 2.Rd3#
    - 2.Rd4#
    - 2.Rxc5#
    - 2.Rdf5#
    - 2.Rg5#
    - 2.Rh5#
    - 2.Rd6#
    - 2.Rd7#
    - 2.Rd8#
  - 1...Be6
    - 2.Rd4#
  - 1...Bd7
    - 2.Rd4#
    - 2.Rxd7#
  - 1...Bc8
    - 2.Rd4#
  - 1...Bd6
    - 2.Rd3#
    - 2.Rd4#
    - 2.Rxc5#
    - 2.Rdf5#
    - 2.Rg5#
    - 2.Rh5#
    - 2.Rxd6#
  - 1...Se3
    - 2.Rd4#
  - 1...Sb4
    - 2.Rd4#
  - 1...Sd4
    - 2.Rxd4#
    - 2.Re5#
  - 1...Rxd5+!
- 1.Rf7?
  - threat
    - 2.Rd4#
    - 2.Rd6#
    - 2.Rdd7#
    - 2.Rxd8#
  - 1...Bxg7
    - 2.Sxc5#
  - 1...Bf5
    - 2.Rd4#
  - 1...Rd7
    - 2.Rd4#
    - 2.Rdxd7#
  - 1...Rd6
    - 2.Sxc5#
    - 2.Rd4#
    - 2.Rxd6#
  - 1...Ra8
    - 2.Rd3#
    - 2.Rd4#
    - 2.Rxc5#
    - 2.Rdf5#
    - 2.Rg5#
    - 2.Rh5#
    - 2.Rd6#
    - 2.Rdd7#
    - 2.Rd8#
  - 1...Rb8
    - 2.Rd4#
  - 1...Rc8
    - 2.Rd4#
  - 1...Re8
    - 2.Rd3#
    - 2.Rd4#
    - 2.Rxc5#
    - 2.Rdf5#
    - 2.Rg5#
    - 2.Rh5#
    - 2.Rd6#
    - 2.Rdd7#
    - 2.Rd8#
  - 1...Be6
    - 2.Rd4#
  - 1...Bd7
    - 2.Rd4#
    - 2.Rdxd7#
  - 1...Bc8
    - 2.Rd4#
  - 1...Bd6
    - 2.Rd3#
    - 2.Rd4#
    - 2.Rxc5#
    - 2.Rdf5#
    - 2.Rg5#
    - 2.Rh5#
    - 2.Rxd6#
  - 1...Se3
    - 2.Rd4#
  - 1...Sb4
    - 2.Rd4#
  - 1...Sd4
    - 2.Rxd4#
    - 2.Re5#
  - 1...Rxd5+!
- 1.Qb3?
  - threat
    - 2.Qxc2#
    - 2.Qd3#
    - 2.Qf3#
  - 1...Rxd5+
    - 2.Qxd5#
  - 1...Bf1
    - 2.Qf3#
  - 1...Bg2
    - 2.Qxc2#
    - 2.Qd3#
  - 1...Bg4
    - 2.Qxc2#
    - 2.Qd3#
  - 1...Sa1
    - 2.Qc4#
    - 2.Qd3#
    - 2.Qe3#
    - 2.Qf3#
  - 1...Se1
    - 2.Qc4#
    - 2.Qe3#
  - 1...Sa3
    - 2.Qd3#
    - 2.Qe3#
    - 2.Qf3#
  - 1...Se3
    - 2.Qd3#
    - 2.Qxe3#
  - 1...Sb4
    - 2.Qc4#
    - 2.Qe3#
    - 2.Qf3#
  - 1...Sd4
    - 2.Rde5#
    - 2.Qd3#
    - 2.Qe3#
  - 1...c4
    - 2.Qxc2#
    - 2.Qf3#
  - 1...Bxf5!
- 1.Qf7?
  - threat
    - 2.Rf4#
    - 2.Re5#
    - 2.Qe6#
  - 1...Rxd5+
    - 2.Qxd5#
  - 1...Bxf5
    - 2.Qxf5#
  - 1...Bxg7
    - 2.Sxc5#
    - 2.Rf4#
  - 1...Rd6
    - 2.Sxc5#
    - 2.Rf4#
    - 2.Re5#
  - 1...Re8
    - 2.Rf4#
  - 1...Sd4
    - 2.Rde5#
    - 2.Rf4#
    - 2.Rfe5#
  - 1...Bd6!
Keys
- 1.Qc6!
  - threat
    - 2.Qe6#
  - 1...Rxd5+
    - 2.Qxd5#
  - 1...Bxf5
    - 2.Rd4#
  - 1...Bxg7
    - 2.Sxc5#
  - 1...Rd6
    - 2.Sxc5#
  - 1...Re8
    - 2.Rxc5#
  - 1...Bd6
    - 2.Rxc5#
  - 1...Sd4
    - 2.Rde5#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 2
Sets
- R(e);CHECK,OGATE,P_SPINR(e),XR(B)::QAB1(E),XR(e)
- R(e);S_CUTB(f)::S(D),XP(d)
- R(e);N_PINR(B)::QAB(E)+R(B),XP(d)
- B(b);SBLOCK,XR(C)::QAB(E)+R(B),DCHECK
- B(f);N_PINR(B)::QAB(E)+R(B),XP(d)
- B(f);N_GUARD::QAR(E),XB(f)
- B(f);N_GUARD,XB(F)::S(D),XP(d)
- S(a);N_PINR(B),SBLOCK::QAB(E)+R(B),DCHECK
Tries
- Try
  - B(F);XB(f)
  - Threat
    - DUALS(2)
  - Vars
    - R(e);CHECK,OGATE,P_SPINR(e),XR(B)::QAB1(E),XR(e)
    - R(e);::S(D),XP(d)
    - R(e);N_PINR(B)::QAR(E)
    - R(e);N_PINR(B)::S(D),XP(d)
  - Refutation
    - B(b);XR(C)
- Try
  - R(B);CHECK
  - Vars
    - R(e);N_GUARD,P_SPINR(e)::QAB1(E),XR(e)
  - Refutation
    - K(c);S_FLIGHT,XR(C)
- Try
  - R(C);
  - Threat
    - DUALS(4)
  - Vars
    - B(f);N_GUARD,XB(F)::S(D),XP(d)
    - R(e);N_PINR(B)::QAB(E)+R(B),DCHECK
    - B(b);::QAB(E)+R(B),DCHECK
    - S(a);::QAB(E)+R(B),DCHECK
  - Refutation
    - R(e);CHECK,P_SPINR(e),XR(B)
- Try
  - R(C);
  - Threat
    - DUALS(4)
  - Vars
    - B(f);N_GUARD,XB(F)::S(D),XP(d)
    - B(b);::QAB(E)+R(B),DCHECK
    - R(e);N_PINR(B)::QAB(E)+R(B),DCHECK
    - S(a);::QAB(E)+R(B),DCHECK
  - Refutation
    - R(e);CHECK,P_SPINR(e),XR(B)
- Try
  - Q(E);
  - Threat
    - DUALS(3)
  - Vars
    - R(e);CHECK,OGATE,XR(B)::QAB1(E),XR(e)
    - B(b);::QAB1(E)
  - Refutation
    - B(b);XR(C)
- Try
  - Q(E);
  - Threat
    - DUALS(3)
  - Vars
    - R(e);CHECK,OGATE,XR(B)::QAB1(E),XR(e)
    - B(b);OGATE,XR(C)::QAB1(E),XB(b)
    - R(e);N_PINR(B)::R1(C)
  - Refutation
    - B(f);N_PINR(B)
Actual
- Q(E);
- Threat
  - QAR2(E)
- Vars
  - R(e);CHECK,OGATE,P_SPINR(e),XR(B)::QAB1(E),XR(e)
  - B(b);SBLOCK,XR(C)::QAB(E)+R(B),DCHECK
  - B(f);N_GUARD,XB(F)::S(D),XP(d)
  - R(e);S_CUTB(f)::S(D),XP(d)
  - R(e);N_PINR(B)::QAB(E)+R(B),XP(d)
  - B(f);N_PINR(B)::QAB(E)+R(B),XP(d)
  - S(a);N_PINR(B),SBLOCK::QAB(E)+R(B),DCHECK

MESON Chess Problem Database

Problem Display

PID: 21883 (3r1b2/1Q4B1/N7/2pR1R2/4k3/7b/2nK4/8 w - - 0 1)

SOLUTION

FEATURES