MESON Chess Problem Database

Problem Display
PID: 21949 (n1B5/4Rn1K/2pp4/bNpk2pp/1P1rN1p1/1Pp2r1q/6P1/1b1RQ3 w - - 0 1)

Larsen, Karl Adolf Koefoed

2nd Prize, Good Companions (March), 1922

n1B5/4Rn1K/2pp4/bNpk2pp/1P1rN1p1/1Pp2r1q/6P1/1b1RQ3

#2

10 + 15

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Rfd3
      • 2.Sf6#
    • 1...Rdd3
      • 2.Sexc3#
    • 1...Bd3
      • 2.Sxc3#
    • 1...Bxe4+
      • 2.Qxe4#
    • 1...Se5
      • 2.Be6#
    • 1...Sb6
      • 2.Sc7#
    • 1...cxb4
      • 2.Rxd4#
    • 1...c4
      • 2.Rxd4#
    • 1...cxb5
      • 2.Bb7#
  • Keys
    • 1.Qe2!
      • threat
        • 2.Qc4#
      • 1...Bxe4+
        • 2.Qxe4#
      • 1...cxb5
        • 2.Bb7#
      • 1...Rfd3
        • 2.Sf6#
      • 1...Rdd3
        • 2.Sexc3#
      • 1...Bd3
        • 2.Sxc3#
      • 1...Se5
        • 2.Be6#
      • 1...Sb6
        • 2.Sc7#
      • 1...c4
        • 2.Rxd4#
        • 2.Qxc4#
        • 2.bxc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • R(c);N_PINS(F),N_SPINR(e)::S(F)
    • R(e);N_PINS(F)::S(F),XP(b)
    • B(a);N_SPINR(e),S_CUTR(c)::S(G),XP(b)
    • B(a);CHECK,OGATE,XS(F)::QAB1(B),XB(a)
    • S(n);SBLOCK::B(J)
    • S(o);N_GUARD,S_CUTB(g)::S(G)
    • P(h);N_GUARD,XP(E)::R1(A),XR(e)
    • P(h);N_GUARD::R1(A),XR(e)
    • P(l);OGATEB,XS(G)::B(J)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • B(a);CHECK,OGATE,XS(F)::QAB1(B),XB(a)
      • P(l);OGATEB,XS(G)::B(J)
      • R(c);N_PINS(F),N_SPINR(e)::S(F)
      • R(e);N_PINS(F)::S(F),XP(b)
      • B(a);N_SPINR(e),S_CUTR(c)::S(G),XP(b)
      • S(n);SBLOCK::B(J)
      • S(o);N_GUARD,S_CUTB(g)::S(G)
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