MESON Chess Problem Database

Problem Display
PID: 147816 (3Q2K1/3bN3/4p3/4kN2/1P2p3/8/3BP2P/8 w - - 0 1)

van der Werf, JD

Schaakblad, 1907

3Q2K1/3bN3/4p3/4kN2/1P2p3/8/3BP2P/8

#2

8 + 4

133 The Problemist Supplement 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Ba4
      • 2.Qd4#
    • 1...Bb5
      • 2.Qd4#
    • 1...Bc6
      • 2.Qd4#
    • 1...Bc8
      • 2.Qd4#
    • 1...Be8
      • 2.Qd4#
  • Tries
    • 1.Sg6+?
      • 1...Kxf5
        • 2.Qg5#
      • 1...Kd5!
    • 1.Bf4+?
      • 1...Kf6
        • 2.Qf8#
      • 1...Kxf4!
    • 1.Qa5+?
      • 1...Bb5
        • 2.Qa1#
      • 1...Kf6!
  • Keys
    • 1.Se3!
      • 1...Kd4
        • 2.Sc6#
      • 1...Kf4
        • 2.Sg6#
      • 1...Kd6
        • 2.Sc4#
      • 1...Kf6
        • 2.Sg4#
      • 1...Ba4
        • 2.Sg4#
        • 2.Sg6#
      • 1...Bb5
        • 2.Sg4#
        • 2.Sg6#
      • 1...Bc6
        • 2.Sg4#
        • 2.Sg6#
      • 1...Bc8
        • 2.Sg4#
        • 2.Sg6#
      • 1...Be8
        • 2.Sg4#

This is after 1936

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • B(d);OGATE::QAB1(G)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(b);P-FLIGHT,XS(E)::QAR1(G)
      • Refutation
        • K(b);P-FLIGHT,P_SPINB(d)
    • Try
      • B(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR2(G)
      • Refutation
        • K(b);S_FLIGHT,XB(A)
    • Try
      • Q(G);CHECK
      • Vars
        • B(d);P_SPINB(d)::QAB(G)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • S(E);
    • Vars
      • K(b);P_SPINB(d),S_FLIGHT::S(F)
      • K(b);S_FLIGHT::S(F)
      • K(b);P_SPINB(d),S_FLIGHT::S(E)
      • K(b);S_FLIGHT::S(E)
      • B(d);::S(E)
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