MESON Chess Problem Database

Problem Display
PID: 23009 (8/8/8/8/b7/5nKn/8/1Q4Nk w - - 0 1)

Lebedev, Aleksandr N

Xadrez Brasileiro, 1935

8/8/8/8/b7/5nKn/8/1Q4Nk

#2

3 + 4

3296 Shakhmatny zadachi miniaturi 1987
3813 300 Sachmatu Uzdaviniu 1991

SOLUTION

  • SOUND
  • Tries
    • 1.Sxf3+?
      • 1...Sg1
        • 2.Qxg1#
      • 1...Bd1!
    • 1.Sxh3+?
      • 1...Se1
        • 2.Qxe1#
      • 1...Sg1
        • 2.Sf2#
        • 2.Qxg1#
      • 1...Bd1!
  • Keys
    • 1.Qf1!
      • threat
        • 2.Qg2#
      • 1...Se1
        • 2.Sxh3#
      • 1...Sh4
        • 2.Sxh3#
      • 1...Sf4
        • 2.Sxf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(B);CHECK,XS(b)
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAR1(A),XS(c)
      • Refutation
        • B(d);P_SPINB(d)
    • Try
      • S(B);CHECK,XS(c)
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAR(A),XS(b)
      • Refutation
        • B(d);P_SPINB(d)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • S(b);N_GUARD::QAR(A)+S(B),XS(c)
      • S(c);N_GUARD::QAR(A)+S(B),XS(b)
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