MESON Chess Problem Database

Problem Display
PID: 238133 (5N1n/1ppN4/1pk5/5PQK/P3b3/2pP4/6pB/7B w - - 0 1)

Hermanson, Halvar

Problemas, 1974

5N1n/1ppN4/1pk5/5PQK/P3b3/2pP4/6pB/7B

#2

9 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...g1Q
      • 2.Bxe4#
    • 1...g1S
      • 2.Bxe4#
    • 1...g1B
      • 2.Bxe4#
    • 1...g1R
      • 2.Bxe4#
  • Tries
    • 1.Bxg2?
      • threat
        • 2.Bxe4#
      • 1...Bf3+
        • 2.Bxf3#
      • 1...Bxg2
        • 2.Qxg2#
      • 1...Bd5
        • 2.Qf6#
      • 1...Kd5!
  • Keys
    • 1.Qxg2!
      • threat
        • 2.Qxe4#
      • 1...Bf3+
        • 2.Qxf3#
      • 1...Kd5
        • 2.Qxe4#
      • 1...Bxg2
        • 2.Bxg2#
      • 1...Bd5
        • 2.Qxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • P(a);OGATE,P_SPINB(c)::B(A),XB(c)
  • Tries
    • Try
      • B(A);P_PINB(c),XP(a)
      • Threat
        • B(A),XB(c)
      • Vars
        • B(c);CHECK,OGATEB::B(A),XB(c)
        • B(c);N_SPINB(c),OGATE,XB(A)::QAB(F),XB(c)
        • B(c);::QAR(F)
      • Refutation
        • K(e);S_FLIGHT
  • Actual
    • Q(F);P_PINB(c),XP(a)
    • Threat
      • QAB(F),XB(c)
    • Vars
      • B(c);CHECK,OGATEB::QAB(F),XB(c)
      • K(e);S_FLIGHT::QAB1(F),XB(c)
      • B(c);OGATE,XQ(F)::B(A),XB(c)
      • B(c);OGATE::QAB1(F),XB(c)
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