MESON Chess Problem Database

Problem Display
PID: 225819 (B3K3/8/8/p1kP4/1NP2P2/Q2R4/R1P5/8 w - - 0 1)

Ulanov, Lev

Praca, 1993

B3K3/8/8/p1kP4/1NP2P2/Q2R4/R1P5/8

#2

10 + 2

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kb6
      • 2.Qxa5#
    • 1...Kd6
      • 2.Sa6#
  • Tries
    • 1.Sa6+?
      • 1...Kxc4
        • 2.Qc5#
        • 2.Qb3#
        • 2.Qa4#
      • 1...Kb6!
    • 1.Sc6+?
      • 1...Kb6
        • 2.Qxa5#
      • 1...Kxc4!
    • 1.Qxa5+?
      • 1...Kd6
        • 2.Qb6#
        • 2.c5#
      • 1...Kxc4!
  • Keys
    • 1.Qa4!
      • 1...Kxc4
        • 2.Sa6#
      • 1...Kb6
        • 2.Qxa5#
      • 1...Kd6
        • 2.Qc6#
      • 1...axb4
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::QAB1(C),XP(a)
    • K(b);S_FLIGHT::QAB(C)+S(E)
  • Tries
    • Try
      • S(E);CHECK
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(E);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(C),XP(a)
      • Refutation
        • K(b);P-FLIGHT,XP(F)
    • Try
      • Q(C);CHECK,XP(a)
      • Refutation
        • K(b);P-FLIGHT,XP(F)
  • Actual
    • Q(C);
    • Vars
      • K(b);P-FLIGHT,XP(F)::QAR(C)+S(E)
      • K(b);S_FLIGHT::QAB1(C),XP(a)
      • K(b);S_FLIGHT::QAR1(C)
      • P(a);SBLOCK,XS(E)::QAR1(C)
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