MESON Chess Problem Database

Problem Display
PID: 79926 (6Q1/8/8/8/6K1/8/5Pk1/3R2b1 w - - 0 1)

Andreev, Aleksandr Grigorevich

Sovietskaya Kuban, 1960

6Q1/8/8/8/6K1/8/5Pk1/3R2b1

#2

4 + 2

15148 Sadier Collection 2016
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Kf4+?
      • 1...Kh1
        • 2.Qxg1#
      • 1...Kxf2
        • 2.Qa2#
      • 1...Kh3
        • 2.Qg3#
      • 1...Kh2!
    • 1.Qd5+?
      • 1...Kxf2
        • 2.Qf3#
        • 2.Qd2#
      • 1...Kh2!
    • 1.Qa8+?
      • 1...Kxf2
        • 2.Qf3#
      • 1...Kh2!
  • Keys
    • 1.Qb3!
      • 1...Kh1
        • 2.Qh3#
      • 1...Kxf2
        • 2.Qf3#
      • 1...Kh2
        • 2.Qh3#
      • 1...Bxf2
        • 2.Qh3#
      • 1...Bh2
        • 2.Qf3#

This anticipates 22925(1973)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(C);CHECK,P-FLIGHT
      • Vars
        • K(b);OGATE,P_SPINB(a),S_FLIGHT::QAR1(D),XB(a)
        • K(b);OGATEB,P-FLIGHT,XP(B)::QAR(D)
        • K(b);S_FLIGHT::QAR1(D)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(D);CHECK
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);P-FLIGHT,XP(B)::QAR1(D)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(D);
    • Vars
      • K(b);P_SPINB(a),S_FLIGHT::QAR2(D)
      • K(b);P-FLIGHT,XP(B)::QAR1(D)
      • K(b);P-FLIGHT::QAR1(D)
      • B(a);SBLOCK,XP(B)::QAB1(D)
      • B(a);SBLOCK::QAB1(D)
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