MESON Chess Problem Database

Problem Display
PID: 267506 (k1K5/rp1p4/1R6/8/8/1Q6/8/8 w - - 0 1)

Kovalenko, V?

Zadachi i Etyudi, 2013

k1K5/rp1p4/1R6/8/8/1Q6/8/8

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.Qxa2#
    • 1...Ra3
      • 2.Qxa3#
    • 1...Ra4
      • 2.Qxa4#
  • Tries
    • 1.Qd5?
      • 1...Ra1
        • 2.Qxb7#
      • 1...Ra2
        • 2.Qxa2#
        • 2.Qxb7#
      • 1...Ra3
        • 2.Qxb7#
      • 1...Ra4
        • 2.Qxb7#
      • 1...Ra5
        • 2.Qxb7#
        • 2.Qxa5#
      • 1...Ra6
        • 2.Rxa6#
        • 2.Qxb7#
      • 1...d6!
  • Keys
    • 1.Ra6!
      • threat
        • 2.Qxb7#
      • 1...bxa6
        • 2.Qb8#
      • 1...b5
        • 2.Qd5#
      • 1...b6
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • R(a);OGATEB::QAR(A),XR(a)
  • Tries
    • Try
      • Q(A);P_PINP(b)
      • Vars
        • R(a);N_GUARD::QAB1(A),XP(b)
      • Refutation
        • P(c);
  • Actual
    • R(B);P_PINR(a)
    • Threat
      • QAB1(A),XP(b)
    • Vars
      • P(b);N_SPINR(a),OGATE,XR(B)::QAR1(A)
      • P(b);OGATEB::QAB(A)
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