MESON Chess Problem Database

Problem Display
PID: 250537 (8/K7/4p3/4P3/p1kP4/pNP5/Q2R1N2/4B3 w - - 0 1)

Ulanov, Leonid

Schweizerische Schachzeitung, 1997

8/K7/4p3/4P3/p1kP4/pNP5/Q2R1N2/4B3

#2

9 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Kxc3
      • 2.Rc2#
    • 1...Kd5
      • 2.Sa5#
  • Tries
    • 1.Ka6?
      • 1...Kxc3
        • 2.Rc2#
      • 1...Kd5
        • 2.Sa5#
      • 1...axb3!
    • 1.Kb6?
      • 1...Kxc3
        • 2.Rc2#
      • 1...Kd5
        • 2.Sa1#
        • 2.Sc1#
        • 2.Sa5#
        • 2.Sc5#
      • 1...axb3!
    • 1.Sa1+?
      • 1...Kxc3
        • 2.Rd1#
        • 2.Rd3#
      • 1...Kb5!
    • 1.Sc1+?
      • 1...Kxc3
        • 2.Rd1#
        • 2.Rd3#
      • 1...Kb5!
    • 1.Sa5+?
      • 1...Kxc3
        • 2.Rd1#
        • 2.Rd3#
        • 2.Qc4#
        • 2.Qxa3#
      • 1...Kb5!
    • 1.Sc5+?
      • 1...Kxc3
        • 2.Rd1#
        • 2.Rd3#
      • 1...Kb5!
  • Keys
    • 1.Qxa3!
      • 1...Kxc3
        • 2.Sa5#
      • 1...Kb5
        • 2.Qc5#
      • 1...Kd5
        • 2.Qc5#
      • 1...axb3
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(c);OGATEB,P-FLIGHT,XP(F)::B(A)+R(C),DCHECK
    • K(c);N_GUARD,S_FLIGHT::QAB(B)+S(E)
  • Tries
    • Try
      • K(I);P-FLIGHT
      • Vars
        • K(c);OGATEB,P-FLIGHT,XP(F)::B(A)+R(C),DCHECK
        • K(c);N_GUARD,S_FLIGHT::QAB(B)+S(E)
      • Refutation
        • P(b);P_SPINP(b),XS(E)
    • Try
      • K(I);S_FLIGHT
      • Vars
        • K(c);OGATEB,P-FLIGHT,XP(F)::B(A)+R(C),DCHECK
      • Refutation
        • P(b);P_SPINP(b),XS(E)
    • Try
      • S(E);CHECK
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • S(E);CHECK
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • S(E);CHECK
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • S(E);CHECK
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • Q(B);XP(a)
    • Vars
      • K(c);N_GUARD,P-FLIGHT,XP(F)::QAR(B)+S(E)
      • K(c);N_GUARD,S_FLIGHT::QAR1(B)
      • P(b);SBLOCK,XS(E)::QAR1(B)
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