MESON Chess Problem Database

Problem Display
PID: 160061 (7B/8/8/pp6/P7/k7/1N6/1Q1K4 w - - 0 1)

Bogdanov, Evgeny Mikhailovich

British Chess Magazine, 2002

7B/8/8/pp6/P7/k7/1N6/1Q1K4

#2

5 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...bxa4
      • 2.Sc4#
  • Tries
    • 1.Kc2?
      • 1...bxa4
        • 2.Sc4#
      • 1...b4
        • 2.Qa1#
      • 1...Kb4!
    • 1.Sd3?
      • 1...Kxa4
        • 2.Qa2#
      • 1...bxa4
        • 2.Qb2#
      • 1...b4!
    • 1.Qa2+?
      • 1...Kb4
        • 2.Sd3#
      • 1...Kxa2!
    • 1.Qd3+?
      • 1...Kb4
        • 2.Qc3#
      • 1...Ka2!
  • Keys
    • 1.Qc2!
      • 1...Ka2
        • 2.Sc4#
      • 1...Kb4
        • 2.Qc3#
      • 1...bxa4
        • 2.Qxa4#
      • 1...b4
        • 2.Sc4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(c);N_GUARD,SBLOCK,XP(D)::S(C)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Vars
        • P(c);N_GUARD,SBLOCK,XP(D)::S(C)
        • P(c);SBLOCK::QAR2(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(C);
      • Vars
        • K(a);P-FLIGHT,XP(D)::QAR2(A)
        • P(c);SBLOCK,XP(D)::QAB1(A)
      • Refutation
        • P(c);
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);S_FLIGHT::S(C)
      • Refutation
        • K(a);P-FLIGHT,XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(A)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(a);P-FLIGHT::QAR(A)+S(C)
      • K(a);S_FLIGHT::QAB1(A)
      • P(c);OGATE,XP(D)::QAR1(A),XP(c)
      • P(c);N_GUARD,SBLOCK::S(C)
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