MESON Chess Problem Database

Problem Display
PID: 21891 (8/1rp5/3p2N1/3k1BN1/2r1p2K/1Q2B1pb/2qP4/8 w - - 0 1)

Larsen, Karl Adolf Koefoed

1st HM., Tidskrift for Schack, 1921

8/1rp5/3p2N1/3k1BN1/2r1p2K/1Q2B1pb/2qP4/8

#2

7 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Kc6
      • 2.Se7#
    • 1...Qd1
      • 2.Bxe4#
    • 1...Qc1
      • 2.Bxe4#
    • 1...Qa2
      • 2.Bxe4#
    • 1...Qb2
      • 2.Bxe4#
    • 1...Qxd2
      • 2.Bxe4#
    • 1...Qc3
      • 2.Bxe4#
    • 1...c5
      • 2.Qxb7#
  • Tries
    • 1.Sf7?
      • threat
        • 2.Se7#
      • 1...Kc6
        • 2.Se7#
      • 1...c5
        • 2.Qxb7#
      • 1...c6
        • 2.Sf4#
      • 1...Bxf5!
    • 1.Be6+?
      • 1...Kc6
        • 2.Se7#
      • 1...Bxe6!
    • 1.Qxb7+?
      • 1...c6
        • 2.Qf7#
      • 1...Rc6!
  • Keys
    • 1.d4!
      • threat
        • 2.Se7#
      • 1...exd4 ep+
        • 2.Be4#
      • 1...Kc6
        • 2.Se7#
      • 1...c5
        • 2.Qxb7#
      • 1...c6
        • 2.Sf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • K(f);N_SPINR(d),S_FLIGHT::S(G)
    • Q(a);N_GUARD::B(E),XP(e)
    • Q(a);N_GUARD,XP(A)::B(E),XP(e)
    • P(i);N_GUARD::QAB(B),XR(h)
  • Tries
    • Try
      • S(F);
      • Threat
        • S(G)
      • Vars
        • K(f);N_SPINR(d),S_FLIGHT::S(G)
        • P(i);N_GUARD::QAB(B),XR(h)
        • P(i);SBLOCK::S(G)
      • Refutation
        • B(c);XB(E)
    • Try
      • B(E);CHECK
      • Vars
        • K(f);N_SPINR(d),S_FLIGHT::S(G)
      • Refutation
        • B(c);XB(E)
    • Try
      • Q(B);CHECK,N_PINR(d),XR(h)
      • Vars
        • P(i);OGATE,P_SPINP(i),SBLOCK::QAB(B)
      • Refutation
        • R(d);P_SPINR(d)
  • Actual
    • P(A);
    • Threat
      • S(G)
    • Vars
      • P(e);CHECK,EP,S_CUTQ(a),XP(A)::B(E)
      • K(f);N_SPINR(d),S_FLIGHT::S(G)
      • P(i);N_GUARD::QAB(B),XR(h)
      • P(i);SBLOCK::S(G)
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