MESON Chess Problem Database

Problem Display
PID: 243796 (1B4b1/3B1p2/2PR2p1/4k1p1/8/3K1P2/8/8 w - - 0 1)

Jonsson, Christer

Tidskrift for Schack, 1981

1B4b1/3B1p2/2PR2p1/4k1p1/8/3K1P2/8/8

#2

6 + 5

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kf4
      • 2.Rf6#
    • 1...f6
      • 2.Rd4#
  • Tries
    • 1.Re6+?
      • 1...Kd5
        • 2.Re5#
      • 1...Kf5!
    • 1.f4+?
      • 1...Kxf4
        • 2.Rf6#
      • 1...gxf4!
  • Keys
    • 1.Kc4!
      • threat
        • 2.Rxg6#
      • 1...f5+
        • 2.Re6#
      • 1...f6+
        • 2.Rd5#
      • 1...Kf4
        • 2.Rd3#

Anticipated by 40315(1935)

This anticipates 163393(2004)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::B(F)+R(D),DCHECK
    • P(d);SBLOCK::B(F)+R(D)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • K(a);P-FLIGHT::R1(D)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • P(B);CHECK
      • Vars
        • K(a);S_FLIGHT,XP(B)::B(F)+R(D),DCHECK
      • Refutation
        • P(b);XP(B)
  • Actual
    • K(A);S_FLIGHT
    • Threat
      • B(F)+R(D),XP(c)
    • Vars
      • P(d);CHECK,SBLOCK::B(F)+R(D),DCHECK
      • K(a);S_FLIGHT::B(F)+R(D)
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