MESON Chess Problem Database

Problem Display
PID: 198577 (5K2/8/4pkp1/2Q2p2/R7/8/8/8 w - - 0 1)

Krivenko, Valery Aleksinovich

Suomen Shakki, 1987

5K2/8/4pkp1/2Q2p2/R7/8/8/8

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...f4
      • 2.Rxf4#
    • 1...e5
      • 2.Qe7#
  • Tries
    • 1.Qe3?
      • 1...f4
        • 2.Qxf4#
      • 1...e5
        • 2.Ra6#
      • 1...g5!
    • 1.Qb4?
      • 1...Ke5
        • 2.Qd4#
      • 1...Kg5
        • 2.Qh4#
      • 1...f4
        • 2.Qxf4#
      • 1...e5
        • 2.Qe7#
      • 1...g5!
    • 1.Qd4+?
      • 1...Kg5
        • 2.Qh4#
      • 1...e5!
    • 1.Qc7?
      • 1...f4
        • 2.Qxf4#
      • 1...e5
        • 2.Qe7#
      • 1...g5
        • 2.Qg7#
      • 1...Kg5!
  • Keys
    • 1.Rh4!
      • 1...Kg5
        • 2.Qe7#
      • 1...e5
        • 2.Qe7#
      • 1...g5
        • 2.Rh6#
      • 1...f4
        • 2.Rxf4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATEB::R(A),XP(a)
    • P(b);::QAB1(B)
  • Tries
    • Try
      • Q(B);
      • Vars
        • P(a);OGATEB::QAR2(B),XP(a)
        • P(b);OGATEB::R(A)
      • Refutation
        • P(d);
    • Try
      • Q(B);
      • Vars
        • K(c);S_FLIGHT::QAB1(B)
        • P(a);OGATEB::QAR2(B),XP(a)
        • P(b);::QAB1(B)
      • Refutation
        • P(d);
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);S_FLIGHT::QAB1(B)
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • Q(B);
      • Vars
        • P(a);OGATEB::QAR2(B),XP(a)
        • P(b);::QAB1(B)
        • P(d);::QAB1(B)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • R(A);
    • Vars
      • K(c);P_SPINP(a),S_FLIGHT::QAB(B)
      • P(b);::QAB1(B)
      • P(d);OGATEB,SBLOCK::R(A)
      • P(a);OGATEB::R(A),XP(a)
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