MESON Chess Problem Database

Problem Display
PID: 104353 (8/N1n5/1k6/R1N5/8/1K6/8/Q7 w - - 0 1)

Istokovics, Ferenc

Kharkov-325 JT, 1983

8/N1n5/1k6/R1N5/8/1K6/8/Q7

#2

5 + 2

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Qe5?
      • 1...Kxa5
        • 2.Qxc7#
      • 1...Sa6
        • 2.Rxa6#
      • 1...Sb5
        • 2.Ra6#
      • 1...Se6
        • 2.Ra6#
      • 1...Sa8
        • 2.Ra6#
      • 1...Se8
        • 2.Ra6#
      • 1...Sd5!
    • 1.Qf6+?
      • 1...Kxa5
        • 2.Sb7#
      • 1...Se6!
  • Keys
    • 1.Qg7!
      • 1...Kxa5
        • 2.Qxc7#
      • 1...Sb5
        • 2.Rxb5#
      • 1...Sd5
        • 2.Rb5#
      • 1...Sa6
        • 2.Rb5#
      • 1...Se6
        • 2.Rb5#
      • 1...Sa8
        • 2.Rb5#
      • 1...Se8
        • 2.Rb5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);
      • Vars
        • K(a);S_FLIGHT,XR(C)::QAB(A),XS(b)
        • S(b);N_GUARD::R1(C),XS(b)
        • S(b);N_GUARD::R1(C)
      • Refutation
        • S(b);
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);S_FLIGHT,XR(C)::S(D)
      • Refutation
        • S(b);P_SPINS(b)
  • Actual
    • Q(A);
    • Vars
      • K(a);S_FLIGHT,XR(C)::QAB(A),XS(b)
      • S(b);N_GUARD::R1(C),XS(b)
      • S(b);N_GUARD::R1(C)
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