MESON Chess Problem Database

Problem Display
PID: 2479 (8/4K3/3N3B/3pk2n/6R1/8/8/4n3 w - - 0 1)

Loyd, Sam

New York Musical World, 1859

8/4K3/3N3B/3pk2n/6R1/8/8/4n3

#2

4 + 4

1679 American Chess Nuts 1868
5206 Sam Loyd and His Chess Problems 1913
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sg3
      • 2.Bg7#
    • 1...Sf4
      • 2.Bg7#
    • 1...Sg7
      • 2.Bxg7#
  • Tries
    • 1.Be3?
      • threat
        • 2.Bd4#
        • 2.Rg5#
      • 1...d4
        • 2.Rg5#
      • 1...Sc2
        • 2.Rg5#
      • 1...Sg3
        • 2.Bd4#
      • 1...Sf4
        • 2.Rg5#
      • 1...Sg7
        • 2.Bd4#
      • 1...Sf3!
    • 1.Bg7+?
      • 1...Sf6
        • 2.Bxf6#
      • 1...Sxg7!
  • Keys
    • 1.Rf4!
      • threat
        • 2.Sf7#
      • 1...Sxf4
        • 2.Bg7#
      • 1...d4
        • 2.Rf5#

This anticipates 23030(1996), 239227(2004), 199903(2017)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • S(d);N_GUARD::B(C)
    • S(d);N_GUARD::B(C),XS(d)
  • Tries
    • Try
      • B(C);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);::R(A)
        • S(a);::R(A)
        • S(d);::B(C)
        • S(d);::R(A)
      • Refutation
        • S(a);
    • Try
      • B(C);CHECK
      • Vars
        • S(d);N_GUARD,P_SPINS(d)::B(C),XS(d)
      • Refutation
        • S(d);XB(C)
  • Actual
    • R(A);
    • Threat
      • S(B)
    • Vars
      • S(d);N_GUARD,SBLOCK,XR(A)::B(C)
      • P(b);SBLOCK::R1(A)
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