MESON Chess Problem Database

Problem Display
PID: 172317 (5B1n/8/5pkp/8/5K2/7Q/8/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

Vecherni Krasnodar, 1996

5B1n/8/5pkp/8/5K2/7Q/8/8

#2

3 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sf7
      • 2.Qf5#
    • 1...f5
      • 2.Qxf5#
  • Tries
    • 1.Qg2+?
      • 1...Kh5
        • 2.Qg4#
      • 1...Kh7
        • 2.Qg7#
      • 1...Kf7!
    • 1.Qg4+?
      • 1...Kh7
        • 2.Qg7#
      • 1...Kf7!
    • 1.Qe6?
      • 1...Kh5
        • 2.Qg4#
      • 1...Sf7
        • 2.Qf5#
      • 1...h5
        • 2.Qg8#
      • 1...Kh7!
    • 1.Qg3+?
      • 1...Kh5
        • 2.Qg4#
      • 1...Kh7
        • 2.Qg7#
      • 1...Kf7!
  • Keys
    • 1.Qd7!
      • 1...Kh5
        • 2.Qg4#
      • 1...Sf7
        • 2.Qf5#
      • 1...f5
        • 2.Qxf5#
      • 1...h5
        • 2.Qg7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(d);SBLOCK::QAB1(A)
    • P(a);::QAB1(A),XP(a)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
        • K(b);OGATE,S_FLIGHT::QAR1(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAR1(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);P_PINP(a)
      • Vars
        • K(b);N_SPINP(a),S_FLIGHT::QAB1(A)
        • S(d);SBLOCK::QAB1(A)
        • P(c);SBLOCK::QAR2(A)
      • Refutation
        • K(b);N_SPINP(a),S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
        • K(b);OGATE,S_FLIGHT::QAR1(A)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(b);S_FLIGHT::QAB1(A)
      • S(d);SBLOCK::QAB1(A)
      • P(a);::QAB1(A),XP(a)
      • P(c);SBLOCK::QAR1(A)
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