MESON Chess Problem Database

Problem Display
PID: 119894 (5bN1/3p4/2pN4/4k3/2B5/2P1BpK1/Q7/2qn4 w - - 0 1)

Erlin, Konrad (AKA Erlinger, Konrad)

Bohemia, 1901

5bN1/3p4/2pN4/4k3/2B5/2P1BpK1/Q7/2qn4

#2

7 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Bf4#
    • 1...Qa3
      • 2.Bf4#
    • 1...Qa1
      • 2.Bf4#
    • 1...Qb1
      • 2.Bf4#
    • 1...Qc2
      • 2.Bf4#
  • Tries
    • 1.Sf7+?
      • 1...Kf5
        • 2.Bd3#
      • 1...Ke4!
    • 1.Bd3?
      • threat
        • 2.Sf7#
      • 1...Bxd6
        • 2.Bd4#
      • 1...Kxd6!
    • 1.Qc2?
      • threat
        • 2.Sf7#
      • 1...Qxc2
        • 2.Bf4#
      • 1...Bxd6
        • 2.Bd4#
      • 1...Kxd6!
    • 1.Qa5+?
      • 1...c5
        • 2.Qxc5#
      • 1...Kxd6!
  • Keys
    • 1.Qb1!
      • threat
        • 2.Sf7#
      • 1...Kxd6
        • 2.Qb8#
      • 1...Qxb1
        • 2.Bf4#
      • 1...Bxd6
        • 2.Bd4#
      • 1...Qc2
        • 2.Bf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • Q(a);N_GUARD::B(C)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(d);P-FLIGHT::B(E)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • B(E);
      • Threat
        • S(F)
      • Vars
        • B(g);SBLOCK,XS(F)::B(C)
      • Refutation
        • K(d);S_FLIGHT,XS(F)
    • Try
      • Q(A);
      • Threat
        • S(F)
      • Vars
        • Q(a);N_GUARD,XQ(A)::B(C)
        • B(g);SBLOCK,XS(F)::B(C)
      • Refutation
        • K(d);S_FLIGHT,XS(F)
    • Try
      • Q(A);CHECK
      • Vars
        • P(e);P_SPINP(e)::QAR2(A),XP(e)
      • Refutation
        • K(d);S_FLIGHT,XS(F)
  • Actual
    • Q(A);
    • Threat
      • S(F)
    • Vars
      • K(d);OGATEB,S_FLIGHT,XS(F)::QAB(A)
      • Q(a);N_GUARD,XQ(A)::B(C)
      • B(g);SBLOCK,XS(F)::B(C)
      • Q(a);N_GUARD::B(C)
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