MESON Chess Problem Database

Problem Display
PID: 55555 (1Q6/8/8/5p1n/6k1/5N2/5K2/8 w - - 0 1)

Janocko, Jan

Troll, 1992

1Q6/8/8/5p1n/6k1/5N2/5K2/8

#2

3 + 3

5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...f4
      • 2.Qc8#
  • Tries
    • 1.Qd8?
      • threat
        • 2.Qh4#
      • 1...Kh3
        • 2.Qh4#
      • 1...Kf4
        • 2.Qh4#
        • 2.Qd4#
      • 1...f4
        • 2.Qd7#
        • 2.Qc8#
      • 1...Sf6!
    • 1.Qg8+?
      • 1...Kh3
        • 2.Qg2#
      • 1...Kf4
        • 2.Qc4#
      • 1...Sg7!
  • Keys
    • 1.Qh8!
      • 1...Kh3
        • 2.Qxh5#
      • 1...Kf4
        • 2.Qd4#
      • 1...Sf4
        • 2.Qh4#
      • 1...Sg3
        • 2.Qh4#
      • 1...Sf6
        • 2.Qh4#
      • 1...Sg7
        • 2.Qh4#
      • 1...f4
        • 2.Qc8#

Anticipated by 24376(1969), 247879(1991)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • P(b);OGATEB,SBLOCK::QAB(C)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • K(a);S_FLIGHT::QAR1(C)
      • Refutation
        • S(c);
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAB1(C)
        • K(a);P-FLIGHT::QAR(C)
      • Refutation
        • S(c);P_SPINS(c)
  • Actual
    • Q(C);
    • Vars
      • K(a);P_SPINS(c),S_FLIGHT::QAR2(C),XS(c)
      • K(a);P-FLIGHT::QAR2(C)
      • S(c);OGATE,SBLOCK::QAR1(C)
      • S(c);OGATE::QAR1(C)
      • P(b);OGATEB,SBLOCK::QAB(C)
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