MESON Chess Problem Database

Problem Display
PID: 177533 (3k4/2RP1K2/2R5/N1n5/8/8/8/8 w - - 0 1)

Jonsson, Christer

Postsjakk, 1976

3k4/2RP1K2/2R5/N1n5/8/8/8/8

#2

5 + 2

5454 Near Snap 2018
6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sb3
      • 2.Sb7#
    • 1...Sd3
      • 2.Sb7#
    • 1...Sa4
      • 2.Sb7#
    • 1...Se4
      • 2.Sb7#
    • 1...Sa6
      • 2.Sb7#
    • 1...Se6
      • 2.Sb7#
    • 1...Sb7
      • 2.Sxb7#
    • 1...Sxd7
      • 2.Sb7#
      • 2.Rc8#
  • Tries
    • 1.Ra7?
      • threat
        • 2.Rc8#
      • 1...Sxd7
        • 2.Sb7#
      • 1...Sb7!
  • Keys
    • 1.Rd6!
      • threat
        • 2.Rc8#
      • 1...Kxc7
        • 2.d8Q#
      • 1...Sxd7
        • 2.Rdxd7#

Anticipated by 6029(1925-1926)

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 7
  • Sets
    • S(a);N_GUARD::S(A)
    • S(a);N_GUARD::S(A),XS(a)
  • Tries
    • Try
      • R(C);
      • Threat
        • R1(B)
      • Vars
        • S(a);N_GUARD,SBLOCK,XP(D)::S(A)
      • Refutation
        • S(a);
  • Actual
    • R(B);
    • Threat
      • R1(C)
    • Vars
      • K(b);OGATE,S_FLIGHT,XR(C)::P=Q
      • S(a);OGATE,P_SPINS(a),XP(D)::R1(B),XS(a)
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