MESON Chess Problem Database

Problem Display
PID: 133801 (1K6/8/1p6/kp6/8/P2Q4/1B6/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

200 Shakhmatni Zadachi, 1983

1K6/8/1p6/kp6/8/P2Q4/1B6/8

#2

4 + 3

3713 Snap 2016

SOLUTION

  • SOUND
  • Tries
    • 1.Ka7?
      • 1...b4
        • 2.Qa6#
      • 1...Ka4!
    • 1.Kb7?
      • 1...b4
        • 2.Qa6#
      • 1...Ka4!
    • 1.Qe4?
      • threat
        • 2.Qa8#
      • 1...Ka6
        • 2.Qa8#
      • 1...b4!
    • 1.Qd5?
      • threat
        • 2.Qa8#
      • 1...Ka6
        • 2.Qa8#
      • 1...Ka4!
  • Keys
    • 1.a4!
      • threat
        • 2.Qxb5#
      • 1...Kxa4
        • 2.Qa3#
      • 1...Kb4
        • 2.Qxb5#
      • 1...Ka6
        • 2.Qxb5#
      • 1...bxa4
        • 2.Bc3#
      • 1...b4
        • 2.Qb5#

This anticipates 159155(2013)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(D);S_FLIGHT
      • Vars
        • P(b);OGATE::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • K(D);P-FLIGHT
      • Vars
        • P(b);OGATE::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAR(C)
      • Vars
        • K(a);P-FLIGHT::QAR2(C)
      • Refutation
        • P(b);
    • Try
      • Q(C);P_PINP(b)
      • Threat
        • QAR(C)
      • Vars
        • K(a);N_SPINP(b),P-FLIGHT::QAR2(C)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT
  • Actual
    • P(B);
    • Threat
      • QAR1(C),XP(b)
    • Vars
      • K(a);OGATEB,P-FLIGHT,XP(B)::QAR1(C)
      • K(a);S_FLIGHT::QAR1(C),XP(b)
      • K(a);P-FLIGHT,P_SPINP(b)::QAB1(C),XP(b)
      • P(b);N_GUARD,SBLOCK,XP(B)::B(A)
      • P(b);::QAR1(C)
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