MESON Chess Problem Database

Problem Display
PID: 172414 (5nB1/8/7p/6pk/8/7K/3Q4/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kuban segodniya, 1997

5nB1/8/7p/6pk/8/7K/3Q4/8

#2

3 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Se6
      • 2.Bf7#
    • 1...Sd7
      • 2.Bf7#
    • 1...Sh7
      • 2.Bf7#
  • Tries
    • 1.Qb4?
      • 1...g4+
        • 2.Qxg4#
      • 1...Sg6
        • 2.Qg4#
      • 1...Se6
        • 2.Bf7#
      • 1...Sd7
        • 2.Bf7#
      • 1...Sh7
        • 2.Bf7#
      • 1...Kg6!
    • 1.Qf4?
      • 1...g4+
        • 2.Qxg4#
      • 1...Kg6
        • 2.Qf7#
      • 1...Sg6
        • 2.Qg4#
      • 1...Se6
        • 2.Bf7#
        • 2.Qf7#
      • 1...Sd7
        • 2.Bf7#
        • 2.Qf7#
      • 1...Sh7
        • 2.Bf7#
        • 2.Qf7#
      • 1...gxf4!
    • 1.Qd1+?
      • 1...g4+
        • 2.Qxg4#
      • 1...Kg6!
    • 1.Qe2+?
      • 1...g4+
        • 2.Qxg4#
      • 1...Kg6!
    • 1.Qg2?
      • 1...g4+
        • 2.Qxg4#
      • 1...Sg6
        • 2.Qg4#
      • 1...Se6
        • 2.Bf7#
      • 1...Sd7
        • 2.Bf7#
      • 1...Sh7
        • 2.Bf7#
      • 1...Kg6!
    • 1.Qd4?
      • 1...g4+
        • 2.Qxg4#
      • 1...Sg6
        • 2.Qg4#
      • 1...Se6
        • 2.Bf7#
      • 1...Sd7
        • 2.Bf7#
      • 1...Sh7
        • 2.Bf7#
      • 1...Kg6!
    • 1.Qd5?
      • 1...Kg6
        • 2.Qf7#
      • 1...Se6
        • 2.Bf7#
      • 1...Sd7
        • 2.Bf7#
        • 2.Qf7#
      • 1...Sh7
        • 2.Bf7#
        • 2.Qf7#
      • 1...Sg6!
  • Keys
    • 1.Qd7!
      • 1...g4+
        • 2.Qxg4#
      • 1...Kg6
        • 2.Qf7#
      • 1...Sxd7
        • 2.Bf7#
      • 1...Sg6
        • 2.Qg4#
      • 1...Se6
        • 2.Bf7#
        • 2.Qe8#
        • 2.Qf7#
      • 1...Sh7
        • 2.Bf7#
        • 2.Qe8#
        • 2.Qf7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(d);N_GUARD::B(C)
  • Tries
    • Try
      • Q(A);
      • Vars
        • P(a);CHECK::QAB1(A),XP(a)
        • S(d);SBLOCK::QAB1(A)
        • S(d);N_GUARD::B(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • P(a);CHECK::QAB1(A),XP(a)
        • K(b);S_FLIGHT::QAB1(A)
        • S(d);SBLOCK::QAB1(A)
      • Refutation
        • P(a);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • P(a);CHECK,P_SPINP(a)::QAB1(A),XP(a)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • P(a);CHECK,P_SPINP(a)::QAB1(A),XP(a)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • P(a);CHECK::QAB1(A),XP(a)
        • S(d);SBLOCK::QAB1(A)
        • S(d);N_GUARD::B(C)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • P(a);CHECK::QAB1(A),XP(a)
        • S(d);SBLOCK::QAB1(A)
        • S(d);N_GUARD::B(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);P_PINP(a)
      • Vars
        • K(b);N_SPINP(a),S_FLIGHT::QAB1(A)
        • S(d);N_GUARD::B(C)
      • Refutation
        • S(d);
  • Actual
    • Q(A);
    • Vars
      • P(a);CHECK::QAB1(A),XP(a)
      • K(b);S_FLIGHT::QAB1(A)
      • S(d);N_GUARD,XQ(A)::B(C)
      • S(d);SBLOCK::QAB1(A)
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