MESON Chess Problem Database

Problem Display
PID: 18875 (k1NK4/2P5/8/r1N5/4R1p1/5R2/4p1B1/7q w - - 0 1)

Lipton, Michael

American Chess Bulletin, 1959

k1NK4/2P5/8/r1N5/4R1p1/5R2/4p1B1/7q

#2

7 + 5

3174 The Two-move Chess Problem Tradition and Development 1966
56 The Problemist 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Ra3
      • 2.Rxa3#
    • 1...Ra4
      • 2.Rxa4#
    • 1...Ra7
      • 2.Sb6#
  • Tries
    • 1.Rb3?
      • threat
        • 2.Rb8#
      • 1...Qd1+
        • 2.Rd4#
      • 1...Qh4+
        • 2.Re7#
      • 1...Qh8+
        • 2.Re8#
      • 1...Rb5
        • 2.Ra4#
      • 1...Qb1!
  • Keys
    • 1.Rb4!
      • threat
        • 2.Rb8#
      • 1...Qd1+
        • 2.Rd3#
      • 1...Qh4+
        • 2.Rf6#
      • 1...Qh8+
        • 2.Rf8#
      • 1...Qb1
        • 2.Rd3#
      • 1...Rb5
        • 2.Ra3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • R(d);OGATEB::R(B),XR(d)
    • R(d);OGATEB::R(C),XR(d)
    • R(d);SBLOCK::S(F)
  • Tries
    • Try
      • R(B);
      • Threat
        • R1(B)
      • Vars
        • Q(a);CHECK,N_GUARD::B(A)+R(C)
        • R(d);::B(A)+R(C),DCHECK
      • Refutation
        • Q(a);
  • Actual
    • R(C);
    • Threat
      • R1(C)
    • Vars
      • Q(a);CHECK,N_GUARD::B(A)+R(B)
      • Q(a);N_GUARD::B(A)+R(B)
      • R(d);::B(A)+R(B),DCHECK
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