MESON Chess Problem Database

Problem Display
PID: 1980 (1n1k2q1/1Q2p3/4p1B1/6N1/8/8/8/3K4 w - - 0 1)

Loyd, Sam

La Strategie, 1867

1n1k2q1/1Q2p3/4p1B1/6N1/8/8/8/3K4

#2

4 + 5

1679 American Chess Nuts 1868
5206 Sam Loyd and His Chess Problems 1913
5626 European Junior Chess Solving Championship 2003
5405 Chess Solving Yearbook 2003 2004

SOLUTION

  • SOUND
  • Sets
    • 1...Qh7
      • 2.Sxe6#
    • 1...Qg7
      • 2.Sxe6#
    • 1...Qe8
      • 2.Sxe6#
    • 1...Qf8
      • 2.Sxe6#
    • 1...Qh8
      • 2.Sxe6#
  • Tries
    • 1.Sf7+?
      • 1...Ke8
        • 2.Qc8#
      • 1...Qxf7!
  • Keys
    • 1.Be8!
      • threat
        • 2.Qxb8#
      • 1...Kxe8
        • 2.Qc8#
      • 1...Qxe8
        • 2.Sxe6#
      • 1...Sa6
        • 2.Qd7#
      • 1...Sc6
        • 2.Qd7#
      • 1...Sd7
        • 2.Qxd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • Q(e);N_GUARD::S(B),XP(a)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR2(D)
      • Refutation
        • Q(e);XS(B)
  • Actual
    • B(C);
    • Threat
      • QAR2(D),XS(c)
    • Vars
      • K(d);P-FLIGHT,XB(C)::QAR2(D)
      • Q(e);N_GUARD,SBLOCK,XB(C)::S(B),XP(a)
      • S(c);N_GUARD::QAR1(D)
      • S(c);N_GUARD::QAR1(D),XS(c)
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