MESON Chess Problem Database

Problem Display
PID: 86076 (8/8/6p1/6pb/6Pk/8/6KN/7R w - - 0 1)

Speckmann, Werner

Canadian Chess Chat, 1981

8/8/6p1/6pb/6Pk/8/6KN/7R

#2

4 + 4

6490 yacpdb 2009
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bxg4
      • 2.Sf3#
  • Tries
    • 1.Kf2?
      • 1...Bxg4
        • 2.Sf3#
      • 1...Kh3!
  • Keys
    • 1.Kf3!
      • threat
        • 2.Sf1#
      • 1...Bxg4+
        • 2.Sxg4#
      • 1...Kh3
        • 2.Sf1#

Anticipated by 227700(1926)

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • B(c);SBLOCK,XP(D)::R(A)+S(C),DCHECK
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • B(c);SBLOCK,XP(D)::R(A)+S(C),DCHECK
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • K(B);P_SPINP(D),S_FLIGHT
    • Threat
      • R(A)+S(C)
    • Vars
      • B(c);CHECK,XP(D)::R(A)+S(C),XB(c)
      • K(a);P-FLIGHT::R(A)+S(C)
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