MESON Chess Problem Database

Problem Display
PID: 273894 (1b2q3/4p3/2PP4/2Nkp3/2N5/1Q3P2/8/3K2B1 w - - 0 1)

Hersom, Donald H

The Problemist, 1932

1b2q3/4p3/2PP4/2Nkp3/2N5/1Q3P2/8/3K2B1

#2

8 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Kxc6
      • 2.Qb7#
    • 1...Qxc6
      • 2.Qd3#
    • 1...Bxd6
      • 2.Sa5#
    • 1...exd6
      • 2.Sa5#
  • Tries
    • 1.Qb1?
      • threat
        • 2.Qe4#
      • 1...Kxc4
        • 2.Qb3#
      • 1...Kxc6
        • 2.Qb7#
      • 1...e4
        • 2.Qxe4#
      • 1...Qg6!
  • Keys
    • 1.Se4!
      • threat
        • 2.Sa5#
      • 1...Kxc6
        • 2.Sxe5#
      • 1...Ke6
        • 2.Se3#
      • 1...Qxc6
        • 2.Sb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • K(a);OGATEB,S_FLIGHT,XP(G)::QAB1(C)
    • Q(e);SBLOCK,XP(G)::QAR2(C)
    • B(d);SBLOCK,XP(H)::QAB(C)+S(E)
    • P(c);SBLOCK,XP(H)::QAB(C)+S(E)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • K(a);OGATEB,S_FLIGHT,XS(E)::QAB1(C)
        • K(a);OGATEB,S_FLIGHT,XP(G)::QAB1(C)
        • P(b);::QAB1(C),XP(b)
      • Refutation
        • Q(e);
  • Actual
    • S(F);
    • Threat
      • QAB(C)+S(E)
    • Vars
      • K(a);N_GUARD,S_FLIGHT,XP(G)::S(E),XP(b)
      • K(a);N_GUARD,S_FLIGHT::QAB(C)+S(E)
      • Q(e);SBLOCK,XP(G)::QAB(C)+S(E),DCHECK
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