MESON Chess Problem Database

Problem Display
PID: 17151 (8/8/2p3pp/7k/8/7K/6Qn/8 w - - 0 1)

Kalina, Vasily Emanuilovich

64 Shakhmatnoe obozrenie, 1925

8/8/2p3pp/7k/8/7K/6Qn/8

#2

2 + 5

3296 Shakhmatny zadachi miniaturi 1987
3813 300 Sachmatu Uzdaviniu 1991

SOLUTION

  • SOUND
  • Sets
    • 1...Sf1
      • 2.Qg4#
    • 1...Sf3
      • 2.Qg4#
    • 1...Sg4
      • 2.Qxg4#
  • Tries
    • 1.Qd5+?
      • 1...g5
        • 2.Qf7#
      • 1...cxd5!
    • 1.Qe2+?
      • 1...Kg5
        • 2.Qe5#
      • 1...Sg4
        • 2.Qxg4#
      • 1...Sf3!
    • 1.Qg3?
      • threat
        • 2.Qh4#
      • 1...Sf3
        • 2.Qg4#
      • 1...g5!
  • Keys
    • 1.Qe4!
      • threat
        • 2.Qh4#
      • 1...Kg5
        • 2.Qe5#
      • 1...Sf3
        • 2.Qg4#
      • 1...Sg4
        • 2.Qxg4#
      • 1...g5
        • 2.Qe8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(a);N_GUARD::QAB1(A)
    • S(a);N_GUARD::QAB1(A),XS(a)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • P(d);OGATEB,P_SPINP(d),SBLOCK::QAB(A)
      • Refutation
        • P(c);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR2(A)
        • S(a);N_GUARD,P_SPINS(a)::QAB1(A),XS(a)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • S(a);N_GUARD::QAB1(A)
      • Refutation
        • P(d);
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • K(b);P-FLIGHT::QAR2(A)
      • S(a);N_GUARD::QAB1(A)
      • S(a);N_GUARD::QAB1(A),XS(a)
      • P(d);OGATEB,SBLOCK::QAB(A)
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Developed and maintained by Brian Stephenson.
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