MESON Chess Problem Database

Problem Display
PID: 93145 (3R4/B7/1r6/2kB1N2/K4P2/3p4/pPn5/q7 w - - 0 1)

de Koning, Josef JM

Schaakcourant, 1913

3R4/B7/1r6/2kB1N2/K4P2/3p4/pPn5/q7

#2

7 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Se1
      • 2.b4#
    • 1...Sa3
      • 2.b4#
    • 1...Se3
      • 2.b4#
    • 1...Sd4
      • 2.b4#
  • Tries
    • 1.Sg7?
      • threat
        • 2.Se6#
      • 1...Kd4
        • 2.Bxb6#
      • 1...Sd4
        • 2.b4#
      • 1...Qe1!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Sb3#
        • 2.Se6#
      • 1...Kxd4
        • 2.Bxb6#
      • 1...Qxb2
        • 2.Se6#
      • 1...Sxd4
        • 2.b4#
      • 1...Qe1
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • S(c);N_GUARD::P(A)
  • Tries
    • Try
      • S(E);
      • Threat
        • S(E)
      • Vars
        • K(e);S_FLIGHT::B(F),XR(f)
        • S(c);N_GUARD,SBLOCK::P(A)
      • Refutation
        • Q(a);
  • Actual
    • S(E);
    • Threat
      • DUALS(2)
    • Vars
      • K(e);S_FLIGHT,XS(E)::B(F),XR(f)
      • Q(a);XP(A)::S(E)
      • S(c);N_GUARD,SBLOCK,XS(E)::P(A)
      • Q(a);::S(E)
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