MESON Chess Problem Database

Problem Display
PID: 21842 (7q/prN1R1b1/4b3/1RBP2n1/2nP1p2/4k2r/K3PN2/4Q3 w - - 0 1)

Larsen, Karl Adolf Koefoed

Good Companions (October), 1921

7q/prN1R1b1/4b3/1RBP2n1/2nP1p2/4k2r/K3PN2/4Q3

#2

10 + 10

797 Bulletin de la FFE 1922
3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc7
      • 2.Rb3#
    • 1...Be5
      • 2.dxe5#
    • 1...Se5
      • 2.dxe5#
    • 1...Sb6
      • 2.Rb3#
    • 1...Se4
      • 2.Sd1#
  • Tries
    • 1.Rxe6+?
      • 1...Be5
        • 2.dxe5#
      • 1...Se5
        • 2.dxe5#
      • 1...Se4
        • 2.Sd1#
        • 2.Sg4#
        • 2.Rxe4#
      • 1...Sxe6!
    • 1.dxe6?
      • threat
        • 2.Sd5#
      • 1...Rxc7
        • 2.Rb3#
      • 1...Sb6
        • 2.Rb3#
      • 1...Qd8!
  • Keys
    • 1.d6!
      • threat
        • 2.Sd5#
      • 1...Se5+
        • 2.d5#
      • 1...Sb6+
        • 2.Rb3#
      • 1...Rxc7
        • 2.Rb3#
      • 1...Be5
        • 2.dxe5#
      • 1...Se4
        • 2.Sd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • R(h);N_GUARD,XS(I)::R(F)
    • B(i);N_SPINB(f),OGATE::B(G)+P(E),XB(i)
    • S(c);N_SPINB(f),OGATE,P_PINP(H)::B(G)+P(E),XS(c)
    • S(c);P_PINP(H),S_CUTR(h)::R(F)
    • S(e);N_SPINB(f),SBLOCK::S(D)
  • Tries
    • Try
      • R(J);CHECK,XB(f)
      • Vars
        • B(i);OGATE,P_SPINB(i)::B(G)+P(E),XB(i)
        • S(c);OGATE,P_SPINS(c)::B(G)+P(E),XS(c)
      • Refutation
        • S(e);XR(J)
    • Try
      • P(H);XB(f)
      • Threat
        • S(I)
      • Vars
        • R(h);N_GUARD,XS(I)::R(F)
        • S(c);S_CUTR(h)::R(F)
      • Refutation
        • Q(j);
  • Actual
    • P(H);
    • Threat
      • S(I)
    • Vars
      • S(c);CHECK,N_SPINB(f),S_CUTB(i)::B(G)+P(E)
      • S(c);CHECK,S_CUTR(h)::R(F)
      • R(h);N_GUARD,XS(I)::R(F)
      • B(i);N_SPINB(f),OGATE::B(G)+P(E),XB(i)
      • S(e);N_SPINB(f),SBLOCK::S(D)
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