MESON Chess Problem Database

Problem Display
PID: 109981 (1K6/8/8/BkNn1Q2/8/pN6/P4P2/8 w - - 0 1)

Groeneveld, Cornelis

Wola Gulowska, 1992

1K6/8/8/BkNn1Q2/8/pN6/P4P2/8

#2

7 + 3

6490 yacpdb 2009
5454 Near Snap 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Qd3#
    • 1...Kc6
      • 2.Qd7#
  • Tries
    • 1.Se4?
      • 1...Ka4
        • 2.Qd7#
      • 1...Kc4
        • 2.Sd6#
      • 1...Kc6
        • 2.Sd4#
      • 1...Ka6!
  • Keys
    • 1.Sb7!
      • 1...Ka4
        • 2.Qd7#
      • 1...Kc4
        • 2.Sd6#
      • 1...Ka6
        • 2.Qd3#
      • 1...Kc6
        • 2.Sd4#

Anticipated by 66028(1982)

This anticipates 150808(2007), 234966(2007), 135883(2009)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::QAB1(F)
  • Tries
    • Try
      • S(E);P_PINS(c)
      • Vars
        • K(b);N_SPINS(c),S_FLIGHT::QAB(F)
        • K(b);N_SPINS(c),S_FLIGHT::S(E)
        • K(b);N_SPINS(c),S_FLIGHT::S(C)
      • Refutation
        • K(b);N_SPINS(c),S_FLIGHT
  • Actual
    • S(E);P_PINS(c)
    • Vars
      • K(b);N_SPINS(c),S_FLIGHT::QAB(F)
      • K(b);N_SPINS(c),S_FLIGHT::S(E)
      • K(b);N_SPINS(c),S_FLIGHT::S(C)
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