MESON Chess Problem Database

Problem Display
PID: 74082 (8/P4N2/2n5/1N4K1/4k3/1Q6/8/8 w - - 0 1)

Froberg, Johan Hilding Laurentius

Springaren, 1954

8/P4N2/2n5/1N4K1/4k3/1Q6/8/8

#2

5 + 2

3310 2345 Chess Problems 1997
5454 Near Snap 2007
145 StrateGems 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Sd4
      • 2.Sbd6#
    • 1...Se5
      • 2.Sfd6#
  • Tries
    • 1.Kg4?
      • threat
        • 2.Qf3#
      • 1...Sd4
        • 2.Sbd6#
      • 1...Se5+!
  • Keys
    • 1.a8R!
      • 1...Sb4
        • 2.Re8#
      • 1...Sd4
        • 2.Sbd6#
      • 1...Sa5
        • 2.Re8#
      • 1...Se5
        • 2.Sfd6#
      • 1...Sa7
        • 2.Re8#
      • 1...Se7
        • 2.Ra4#
      • 1...Sb8
        • 2.Ra4#
      • 1...Sd8
        • 2.Ra4#

Anticipated by 21725(1920), 17916(1951)

This anticipates 18405(1955), 180227(1969), 252994(1983)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(b);SBLOCK::S(B)
    • S(b);SBLOCK::S(E)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Threat
        • QAB1(A)
      • Vars
        • S(b);SBLOCK::S(B)
      • Refutation
        • S(b);CHECK
  • Actual
    • P(D);
    • Vars
      • S(b);N_GUARD::R(D)
      • S(b);SBLOCK::S(B)
      • S(b);SBLOCK::S(E)
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