MESON Chess Problem Database

Problem Display
PID: 6171 (5N2/K1Rp3r/2P5/3kBRP1/1P1p1P2/8/1N1b4/1Q5b w - - 0 1)

Larsen, Karl Adolf Koefoed

6th Prize, Sahovski Glasnik, 1927

5N2/K1Rp3r/2P5/3kBRP1/1P1p1P2/8/1N1b4/1Q5b

#2

11 + 6

3713 Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Re7
      • 2.Qxh1#
    • 1...Rf7
      • 2.Qxh1#
    • 1...Rg7
      • 2.Qxh1#
    • 1...Be4
      • 2.Qa2#
    • 1...Bxf4
      • 2.Bxf4#
    • 1...d3
      • 2.Qxd3#
    • 1...d6
      • 2.Bf6#
      • 2.Bg7#
      • 2.Bh8#
  • Tries
    • 1.Bxd4+?
      • 1...Kxd4
        • 2.Qd3#
      • 1...Kd6!
    • 1.cxd7?
      • threat
        • 2.Rc5#
      • 1...Rxd7
        • 2.Qxh1#
      • 1...d3
        • 2.Qxd3#
      • 1...Bxb4!
  • Keys
    • 1.Rc8!
      • threat
        • 2.Bb8#
      • 1...dxc6+
        • 2.Bc7#
      • 1...d6+
        • 2.Bg7#
      • 1...Bxf4
        • 2.Bxf4#
      • 1...d3
        • 2.Qxd3#
      • 1...Re7
        • 2.Qxh1#
      • 1...Rf7
        • 2.Qxh1#
      • 1...Be4
        • 2.Qa2#

This anticipates 60711(1935)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(f);N_GUARD::QAB(A),XB(a)
    • B(a);SBLOCK::QAB(A)
    • B(b);OGATE,XP(D)::R(F)+B(E),XB(b)
    • P(c);OGATEB::QAR2(A),XP(c)
  • Tries
    • Try
      • B(E);CHECK,XP(c)
      • Vars
        • K(d);P-FLIGHT,XB(E)::QAR1(A)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • P(H);XP(e)
      • Threat
        • R1(J)
      • Vars
        • R(f);N_GUARD,P_PINR(J),XP(H)::QAB(A),XB(a)
        • P(c);OGATEB::QAR2(A),XP(c)
      • Refutation
        • B(b);XP(C)
  • Actual
    • R(J);
    • Threat
      • R(F)+B(E)
    • Vars
      • P(e);CHECK,SBLOCK,XP(H)::R(F)+B(E)
      • P(e);CHECK,SBLOCK::R(F)+B(E)
      • B(b);OGATE,XP(D)::R(F)+B(E),XB(b)
      • P(c);OGATEB::QAR2(A),XP(c)
      • R(f);N_GUARD::QAB(A),XB(a)
      • B(a);SBLOCK::QAB(A)
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