MESON Chess Problem Database

Problem Display
PID: 21573 (5k1K/R7/1N6/3N3b/8/4R3/8/8 w - - 0 1)

Hannemann, Knud Harald

Skakbladet, 1919

5k1K/R7/1N6/3N3b/8/4R3/8/8

#2

5 + 2

3295 Einfuhrung in die Welt des Schachproblem 1984
145 StrateGems 2006
5454 Near Snap 2008

SOLUTION

  • SOUND
  • Sets
    • 1...Bf7
      • 2.Sd7#
  • Tries
    • 1.Rf3+?
      • 1...Ke8
        • 2.Ra8#
      • 1...Bf7
        • 2.Ra8#
      • 1...Bxf3!
    • 1.Rf7+?
      • 1...Bxf7
        • 2.Sd7#
      • 1...Kxf7!
    • 1.Ra8+?
      • 1...Be8
        • 2.Rf3#
      • 1...Kf7!
  • Keys
    • 1.Sf4!
      • 1...Bd1
        • 2.Sg6#
      • 1...Be2
        • 2.Sg6#
      • 1...Bf3
        • 2.Sg6#
      • 1...Bg4
        • 2.Sg6#
      • 1...Bg6
        • 2.Sxg6#
      • 1...Bf7
        • 2.Sd7#
      • 1...Be8
        • 2.Se6#

This anticipates 77280(1938)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • B(a);SBLOCK::S(C)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • K(b);P-FLIGHT::R(D)
        • B(a);P_SPINB(a)::R(D)
      • Refutation
        • B(a);XR(A)
    • Try
      • R(D);CHECK
      • Vars
        • B(a);SBLOCK,XR(D)::S(C)
      • Refutation
        • K(b);P-FLIGHT,XR(D)
    • Try
      • R(D);CHECK
      • Vars
        • B(a);P_SPINB(a)::R(A)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • S(B);
    • Vars
      • B(a);N_GUARD::S(B)
      • B(a);N_GUARD::S(B),XB(a)
      • B(a);SBLOCK::S(C)
      • B(a);SBLOCK::S(B)
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