MESON Chess Problem Database

Problem Display
PID: 12118 (n7/K2N4/1B1R1n2/1B1N4/2P1P1R1/3k3r/3p1P2/b2Q1b2 w - - 0 1)

Chlubna, Friedrich

Berliner Morgenpost, 1975

n7/K2N4/1B1R1n2/1B1N4/2P1P1R1/3k3r/3p1P2/b2Q1b2

#2

11 + 7

4654 64 + 100 1996

SOLUTION

  • SOUND
  • Sets
    • 1...Bc3
      • 2.Sb4#
    • 1...Bd4
      • 2.c5#
    • 1...Be5
      • 2.Sxe5#
    • 1...Be2
      • 2.Qb1#
  • Tries
    • 1.Be3?
      • threat
        • 2.Sc5#
        • 2.Qxd2#
        • 2.c5#
      • 1...Bd4+
        • 2.c5#
      • 1...Sxe4
        • 2.c5#
      • 1...Sxg4
        • 2.Sc5#
      • 1...Sxd5
        • 2.Qxd2#
      • 1...Sxd7
        • 2.Qxd2#
        • 2.c5#
      • 1...Rh7
        • 2.Qxd2#
        • 2.c5#
      • 1...Bc3
        • 2.Sb4#
        • 2.Sc5#
        • 2.c5#
      • 1...Sb6
        • 2.Sc5#
        • 2.Qxd2#
      • 1...Sc7
        • 2.Sc5#
        • 2.Qxd2#
      • 1...Rxe3!
    • 1.Rg3+?
      • 1...Kxe4
        • 2.Qf3#
      • 1...Rxg3!
  • Keys
    • 1.Ba5!
      • threat
        • 2.Qxd2#
      • 1...Bd4+
        • 2.c5#
      • 1...Kd4
        • 2.S5xf6#
      • 1...Sxe4
        • 2.Sf4#
      • 1...Sxg4
        • 2.Sc3#
      • 1...Bc3
        • 2.Sb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • B(a);SBLOCK::R(I)+S(G),DCHECK
    • B(a);P_PINB(H),SBLOCK::B(F)+P(C)
    • B(a);N_GUARD::S(K),XB(a)
    • B(b);SBLOCK::QAB(A)
  • Tries
    • Try
      • B(H);
      • Threat
        • DUALS(3)
      • Vars
        • B(a);CHECK::B(F)+P(C)
        • S(f);XP(D)::B(F)+P(C)
        • S(f);XR(E)::S(K)
        • S(f);P_SPINS(f),XS(G)::QAR1(A),XP(c)
      • Refutation
        • R(e);XB(H)
    • Try
      • R(E);CHECK
      • Vars
        • K(d);N_SPINP(c),S_FLIGHT,XP(D)::QAB1(A)
      • Refutation
        • R(e);XR(E)
  • Actual
    • B(H);
    • Threat
      • QAR1(A),XP(c)
    • Vars
      • B(a);CHECK,SBLOCK::B(F)+P(C)
      • K(d);P-FLIGHT::R(I)+S(G),XS(f)
      • S(f);SBLOCK,XP(D)::R(I)+S(G),DCHECK
      • S(f);N_GUARD,XR(E)::R(I)+S(G)
      • B(a);SBLOCK::R(I)+S(G),DCHECK
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