MESON Chess Problem Database

Problem Display
PID: 21884 (b3n3/Rr6/1kN4p/8/1p6/2QB4/8/1R5K w - - 0 1)

Larsen, Karl Adolf Koefoed

2nd Prize, Sydsvenska Dagbladet Snallposten (Meredith Ty.), 1921

b3n3/Rr6/1kN4p/8/1p6/2QB4/8/1R5K

#2

6 + 6

3310 2345 Chess Problems 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Rc7
      • 2.Rxb4#
    • 1...Rd7
      • 2.Rxb4#
    • 1...Re7
      • 2.Rxb4#
    • 1...Rf7
      • 2.Rxb4#
    • 1...Rg7
      • 2.Rxb4#
    • 1...Rh7
      • 2.Rxb4#
    • 1...Rb8
      • 2.Rxb4#
  • Tries
    • 1.Qd4+?
      • 1...Kxc6
        • 2.Rc1#
      • 1...Kc7!
  • Keys
    • 1.Sxb4!
      • threat
        • 2.Ra6#
      • 1...Rxa7+
        • 2.Sd5#
      • 1...Rc7+
        • 2.Sc6#
      • 1...Rd7+
        • 2.Sc6#
      • 1...Re7+
        • 2.Sc6#
      • 1...Rf7+
        • 2.Sc6#
      • 1...Rg7+
        • 2.Sc6#
      • 1...Rh7+
        • 2.Sc6#
      • 1...Rb8+
        • 2.Sc6#
      • 1...Kxa7
        • 2.Sc6#
      • 1...Sc7
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 7
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(d);P_PINS(E)::R(A),XP(a)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);N_SPINP(a),P-FLIGHT,XS(E)::R(A)
      • Refutation
        • K(b);N_SPINP(a),P_SPINR(d),S_FLIGHT
  • Actual
    • S(E);XP(a)
    • Threat
      • R1(F)
    • Vars
      • R(d);CHECK,SBLOCK,XR(F)::R(A)+S(E),DCHECK
      • R(d);CHECK::R(A)+S(E)
      • K(b);S_FLIGHT,XR(F)::S(E)
      • S(f);SBLOCK::QAB(C)
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