MESON Chess Problem Database

Problem Display
PID: 6852 (B2n4/1q6/6Q1/8/7K/8/7p/7k w - - 0 1)

Lebedev, Aleksandr N

Els Escacs a Catalunya, 1934

B2n4/1q6/6Q1/8/7K/8/7p/7k

#2

3 + 4

3295 Einfuhrung in die Welt des Schachproblem 1984
3296 Shakhmatny zadachi miniaturi 1987
3813 300 Sachmatu Uzdaviniu 1991

SOLUTION

  • SOUND
  • Sets
    • 1...Qg2
      • 2.Qb1#
      • 2.Qxg2#
    • 1...Qf3
      • 2.Bxf3#
    • 1...Qe4+
      • 2.Bxe4#
    • 1...Qd5
      • 2.Bxd5#
    • 1...Se6
      • 2.Bxb7#
    • 1...Sf7
      • 2.Bxb7#
  • Tries
    • 1.Bxb7+?
      • 1...Sc6
        • 2.Bxc6#
      • 1...Sxb7!
  • Keys
    • 1.Kh3!
      • threat
        • 2.Qb1#
      • 1...Qg2+
        • 2.Qxg2#
      • 1...Qf3+
        • 2.Bxf3#
      • 1...Qe4
        • 2.Bxe4#
      • 1...Sc6
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • Q(c);OGATE::B(C),XQ(c)
    • Q(c);CHECK,OGATE::B(C),XQ(c)
    • S(d);N_GUARD::B(C),XQ(c)
  • Tries
    • Try
      • B(C);CHECK,XQ(c)
      • Vars
        • S(d);N_GUARD,P_SPINS(d)::B(C),XS(d)
      • Refutation
        • S(d);XB(C)
  • Actual
    • K(A);P-FLIGHT
    • Threat
      • QAR(B)
    • Vars
      • Q(c);CHECK,N_GUARD::QAB1(B),XQ(c)
      • Q(c);CHECK,OGATE::B(C),XQ(c)
      • Q(c);OGATE::B(C),XQ(c)
      • S(d);N_SPINQ(c),S_CUTQ(c)::QAB1(B)
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