MESON Chess Problem Database

Problem Display
PID: 21823 (Q1B5/5R2/3pNN2/5k2/5n2/5R2/8/1bb4K w - - 0 1)

Larsen, Karl Adolf Koefoed

3rd HM.=, Good Companions (March Meredith Ty.), 1921

Q1B5/5R2/3pNN2/5k2/5n2/5R2/8/1bb4K

#2

7 + 5

3132 The Good Companion Two-Mover 1922
3310 2345 Chess Problems 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Sg4#
    • 1...Ba2
      • 2.Qe4#
    • 1...Be4
      • 2.Qxe4#
  • Tries
    • 1.Sxf4+?
      • 1...Ke5
        • 2.Qd5#
      • 1...Kg5!
  • Keys
    • 1.Rg3!
      • threat
        • 2.Rg5#
      • 1...Be4+
        • 2.Qxe4#
      • 1...Ke5
        • 2.Sg4#
      • 1...Sxe6
        • 2.Sd7#
      • 1...Se2
        • 2.Qd5#
      • 1...Sg2
        • 2.Qd5#
      • 1...Sd3
        • 2.Qe4#
      • 1...Sh3
        • 2.Qd5#
      • 1...Sd5
        • 2.Qxd5#
      • 1...Sh5
        • 2.Qd5#
      • 1...Sg6
        • 2.Sg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • K(d);N_SPINS(c),P-FLIGHT::S(D)
    • B(a);N_GUARD::QAB1(F)
    • B(a);N_GUARD,P_PINR(B)::QAB1(F),XB(a)
  • Tries
    • Try
      • S(C);CHECK,XS(c)
      • Vars
        • K(d);P-FLIGHT::QAR1(F)
      • Refutation
        • K(d);P-FLIGHT
  • Actual
    • R(B);N_PINS(c)
    • Threat
      • R1(B)
    • Vars
      • B(a);CHECK,N_GUARD::QAB1(F),XB(a)
      • K(d);P-FLIGHT::S(D)
      • S(c);P_SPINS(c),SBLOCK,XS(C)::R(E)+S(D)
      • S(c);N_GUARD::QAR2(F)
      • S(c);S_CUTB(a)::QAB1(F)
      • S(c);N_GUARD::QAR2(F),XS(c)
      • S(c);SBLOCK::R(E)+S(D)
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