MESON Chess Problem Database

Problem Display
PID: 85802 (4K3/8/7p/6pk/7N/8/5Q2/7B w - - 0 1)

Speckmann, Werner

Schweizerische Schachzeitung, 1969

4K3/8/7p/6pk/7N/8/5Q2/7B

#2

4 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...gxh4
      • 2.Qf5#
  • Tries
    • 1.Sg2?
      • 1...Kg6
        • 2.Qf7#
      • 1...g4
        • 2.Qf5#
      • 1...Kg4!
    • 1.Qg3?
      • 1...gxh4
        • 2.Bf3#
      • 1...g4!
  • Keys
    • 1.Sg6!
      • 1...Kg4
        • 2.Qf3#
      • 1...Kxg6
        • 2.Qf7#
      • 1...g4
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • P(a);OGATEB,SBLOCK,XS(C)::QAR2(B)
  • Tries
    • Try
      • S(C);
      • Vars
        • K(b);S_FLIGHT::QAB1(B)
        • P(a);OGATEB::QAR2(B)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • P(a);N_GUARD,XS(C)::B(A)
      • Refutation
        • P(a);
  • Actual
    • S(C);
    • Vars
      • K(b);S_FLIGHT::QAB1(B)
      • K(b);OGATEB,S_FLIGHT,XS(C)::QAB1(B)
      • P(a);OGATEB::QAR2(B)
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