MESON Chess Problem Database

Problem Display
PID: 180411 (kB6/1rp5/N1P4K/8/8/8/Q7/8 w - - 0 1)

Lider, Valentin Viktorovich

Problemista, 1970

kB6/1rp5/N1P4K/8/8/8/Q7/8

#2

5 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb8
      • 2.Sb4#
      • 2.Sc5#
      • 2.Sxc7#
  • Tries
    • 1.Sb4+?
      • 1...Ra7
        • 2.Qxa7#
      • 1...Kxb8!
    • 1.Sc5+?
      • 1...Ra7
        • 2.Qxa7#
      • 1...Kxb8!
    • 1.Ba7?
      • 1...Rxa7
        • 2.Qg8#
      • 1...Rb1
        • 2.Sxc7#
      • 1...Rb2
        • 2.Sxc7#
      • 1...Rb3
        • 2.Sxc7#
      • 1...Rb4
        • 2.Sxc7#
      • 1...Rb5
        • 2.Sxc7#
      • 1...Rb6
        • 2.Sxc7#
      • 1...Rb8
        • 2.Sxc7#
      • 1...Kxa7!
    • 1.Qf2?
      • 1...Rxb8
        • 2.Sxc7#
      • 1...Rb1
        • 2.Qa7#
      • 1...Rb2
        • 2.Qa7#
      • 1...Rb3
        • 2.Qa7#
      • 1...Rb4
        • 2.Qa7#
      • 1...Rb5
        • 2.Qa7#
      • 1...Ra7
        • 2.Qxa7#
      • 1...Rb6!
  • Keys
    • 1.Qg8!
      • 1...Rxb8
        • 2.Qxb8#
      • 1...Rb1
        • 2.Sxc7#
      • 1...Rb2
        • 2.Sxc7#
      • 1...Rb3
        • 2.Sxc7#
      • 1...Rb4
        • 2.Sxc7#
      • 1...Rb5
        • 2.Sxc7#
      • 1...Rb6
        • 2.Sxc7#
      • 1...Ra7
        • 2.Bxc7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAR1(A),XR(a)
      • Refutation
        • K(c);P-FLIGHT,XB(E)
    • Try
      • S(B);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAR1(A),XR(a)
      • Refutation
        • K(c);P-FLIGHT,XB(E)
    • Try
      • B(E);
      • Vars
        • R(a);N_GUARD,SBLOCK,XB(E)::QAR(A)
        • R(a);N_GUARD::S(B),XP(b)
        • R(a);N_GUARD,P_PINP(C)::S(B),XP(b)
      • Refutation
        • K(c);P-FLIGHT,XB(E)
    • Try
      • Q(A);
      • Vars
        • R(a);N_GUARD,SBLOCK,XB(E)::S(B),XP(b)
        • R(a);N_GUARD::QAR1(A)
        • R(a);N_GUARD::QAR1(A),XR(a)
      • Refutation
        • R(a);P_PINP(C)
  • Actual
    • Q(A);
    • Vars
      • R(a);OGATE,P_SPINR(a),XB(E)::QAR1(A),XR(a)
      • R(a);N_GUARD::S(B),XP(b)
      • R(a);N_GUARD,P_PINP(C)::S(B),XP(b)
      • R(a);N_GUARD,SBLOCK::QAR(A)+B(E),XP(b)
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