MESON Chess Problem Database

Problem Display
PID: 172440 (4B2Q/8/7b/6p1/7k/8/4b2K/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kuban segodniya, 1997

4B2Q/8/7b/6p1/7k/8/4b2K/8

#2

3 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...g4
      • 2.Qxh6#
  • Tries
    • 1.Qd4+?
      • 1...Bg4
        • 2.Qf2#
      • 1...g4!
    • 1.Qxh6+?
      • 1...Bh5
        • 2.Qxh5#
      • 1...Kg4!
  • Keys
    • 1.Qe5!
      • threat
        • 2.Qg3#
      • 1...Kg4
        • 2.Qe4#
      • 1...g4
        • 2.Qh5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(c);SBLOCK,S_CUTB(a)::QAR2(C),XB(d)
  • Tries
    • Try
      • Q(C);CHECK,N_PINB(d)
      • Vars
        • B(a);P_SPINB(a),SBLOCK::QAB(C)
      • Refutation
        • P(c);P_SPINP(c)
    • Try
      • Q(C);CHECK,XB(d)
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAR1(C),XB(a)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(C);N_PINB(d)
    • Threat
      • QAB1(C)
    • Vars
      • K(b);P-FLIGHT::QAR2(C)
      • P(c);OGATE::QAR1(C)
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