MESON Chess Problem Database

Problem Display
PID: 110143 (7K/6p1/7k/5R1n/8/B7/8/1Q6 w - - 0 1)

Lebedev, Aleksandr N

Kudesnik, 1997

7K/6p1/7k/5R1n/8/B7/8/1Q6

#2

4 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Qc1+?
      • 1...Kg6
        • 2.Qg5#
      • 1...g5
        • 2.Qxg5#
      • 1...Sf4!
    • 1.Qg1?
      • threat
        • 2.Qg5#
      • 1...g5
        • 2.Qxg5#
      • 1...Sg3!
    • 1.Qb7?
      • 1...Sg3
        • 2.Qxg7#
      • 1...Sf4
        • 2.Qxg7#
      • 1...Sf6
        • 2.Qxg7#
      • 1...g5
        • 2.Qh7#
      • 1...g6
        • 2.Qh7#
      • 1...Kg6!
  • Keys
    • 1.Qh1!
      • threat
        • 2.Qxh5#
      • 1...Kg6
        • 2.Qxh5#
      • 1...g5
        • 2.Rf6#
      • 1...g6
        • 2.Bf8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(A)
        • P(c);P_SPINP(c)::QAB1(A),XP(c)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • P(c);::QAB1(A),XP(c)
      • Refutation
        • S(a);
    • Try
      • Q(A);
      • Vars
        • S(a);N_GUARD::QAB1(A),XP(c)
        • P(c);OGATE::QAR1(A)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(A);P_PINS(a)
    • Threat
      • QAR1(A),XS(a)
    • Vars
      • K(b);N_SPINS(a),P-FLIGHT::QAB1(A),XS(a)
      • P(c);N_GUARD,SBLOCK::R(C)
      • P(c);OGATEB,SBLOCK::B(B)
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