MESON Chess Problem Database

Problem Display
PID: 136851 (4b2K/6p1/5P1k/7N/6Q1/8/8/8 w - - 0 1)

Hildebrand, Alexander

Goteborg Postens, 1993

4b2K/6p1/5P1k/7N/6Q1/8/8/8

#2

4 + 3

6490 yacpdb 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Bxh5
      • 2.Qxg7#
  • Tries
    • 1.Sg3?
      • threat
        • 2.Sf5#
        • 2.Qxg7#
      • 1...gxf6
        • 2.Sf5#
        • 2.Qg7#
      • 1...Bg6
        • 2.Qf4#
      • 1...Bd7
        • 2.Qh5#
        • 2.Qxg7#
      • 1...g6
        • 2.Qh4#
      • 1...g5!
    • 1.Sf4?
      • threat
        • 2.Qxg7#
      • 1...gxf6
        • 2.Qg7#
      • 1...Bg6
        • 2.Qxg6#
      • 1...g6
        • 2.Qh4#
      • 1...g5!
  • Keys
    • 1.Sxg7!
      • threat
        • 2.Sf5#
      • 1...Bg6
        • 2.Qf4#
      • 1...Bd7
        • 2.Qh5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • B(c);SBLOCK,XS(B)::QAB1(A),XP(b)
  • Tries
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • B(c);SBLOCK,S_CUTP(b)::QAB(A)
        • P(b);SBLOCK,S_CUTB(c)::QAR2(A)
      • Refutation
        • P(b);
    • Try
      • S(B);
      • Threat
        • QAB1(A),XP(b)
      • Vars
        • P(b);XP(C)::QAB1(A)
        • B(c);N_GUARD::QAR1(A),XB(c)
        • P(b);S_CUTB(c)::QAR2(A)
      • Refutation
        • P(b);
  • Actual
    • S(B);XP(b)
    • Threat
      • S(B)
    • Vars
      • B(c);SBLOCK::QAB(A)
      • B(c);N_GUARD::QAR1(A)
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