MESON Chess Problem Database

Problem Display
PID: 21641 (1R2B3/2p2n2/1N1N1Q2/p1k5/Pr3p1K/B5p1/3PP3/6bb w - - 0 1)

Larsen, Karl Adolf Koefoed

1st Prize, Good Companions, 1920

1R2B3/2p2n2/1N1N1Q2/p1k5/Pr3p1K/B5p1/3PP3/6bb

#2

10 + 9

3098 FIDE Album (1914-1944) (I) 1971
133 The Problemist Supplement 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Bh2
      • 2.d4#
    • 1...Be4
      • 2.Sxe4#
    • 1...Bb7
      • 2.Sxb7#
    • 1...g2
      • 2.Se4#
      • 2.Sb7#
    • 1...f3+
      • 2.Se4#
    • 1...cxd6
      • 2.Qc3#
  • Tries
    • 1.Bxb4+?
      • 1...Kxb4
        • 2.Qc3#
      • 1...axb4!
    • 1.Qe5+?
      • 1...Bd5
        • 2.Se4#
        • 2.Qxd5#
      • 1...Sxe5!
    • 1.e3?
      • threat
        • 2.Qd4#
        • 2.d4#
      • 1...fxe3+
        • 2.d4#
      • 1...cxb6
        • 2.Qd4#
      • 1...Bb7
        • 2.Sxb7#
        • 2.Qd4#
      • 1...Bd5
        • 2.d4#
      • 1...Se5
        • 2.d4#
      • 1...Bxe3!
  • Keys
    • 1.e4!
      • threat
        • 2.Sb7#
      • 1...fxe4 ep+
        • 2.d4#
      • 1...Bxe4
        • 2.Sxe4#
      • 1...Sxd6
        • 2.Qe5#
      • 1...cxb6
        • 2.Rc8#
      • 1...cxd6
        • 2.Qc3#
      • 1...Se5
        • 2.Qxe5#
      • 1...Sd8
        • 2.Qe5#
      • 1...c6
        • 2.Sd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 3
  • Sets
    • B(a);N_GUARD::P(A)
    • B(b);N_GUARD::S(G),XB(b)
    • P(e);CHECK,S_CUTB(b)::S(G)
    • P(h);SBLOCK,XS(G)::QAR2(H)
  • Tries
    • Try
      • B(C);CHECK,XR(d)
      • Vars
        • K(g);S_FLIGHT,XB(C)::QAB1(H)
      • Refutation
        • P(f);XB(C)
    • Try
      • Q(H);CHECK
      • Refutation
        • S(i);XQ(H)
    • Try
      • P(B);
      • Threat
        • DUALS(2)
      • Vars
        • P(e);CHECK,XP(B)::P(A)
        • P(h);XS(F)::QAB1(H)
        • B(b);::P(A)
        • S(i);::P(A)
      • Refutation
        • B(a);XP(B)
  • Actual
    • P(B);
    • Threat
      • S(G)
    • Vars
      • P(e);CHECK,EP,S_CUTB(a),XP(B)::P(A)
      • B(b);XP(B)::S(G),XB(b)
      • S(i);N_GUARD,XS(G)::QAR2(H)
      • P(h);OGATEB,SBLOCK,XS(F)::R(I)
      • P(h);SBLOCK,XS(G)::QAR2(H)
      • S(i);N_GUARD::QAR2(H),XS(i)
      • S(i);N_GUARD::QAR2(H)
      • P(h);SBLOCK::S(F)
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