MESON Chess Problem Database

Problem Display
PID: 258027 (4R3/BK1Qn1r1/2Bp4/pR1pq2N/4knPp/4Np2/2PP4/8 w - - 0 1)

Boersma, Kornelis Thomas

Probleemblad, 1948

4R3/BK1Qn1r1/2Bp4/pR1pq2N/4knPp/4Np2/2PP4/8

#2

11 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Qf5#
    • 1...Qb2
      • 2.Qf5#
    • 1...Qc3
      • 2.Qf5#
    • 1...Qd4
      • 2.Qf5#
    • 1...Qf5
      • 2.Qxf5#
    • 1...Se2
      • 2.d3#
    • 1...Sg2
      • 2.d3#
    • 1...Sh3
      • 2.d3#
    • 1...Se6
      • 2.d3#
    • 1...Sfg6
      • 2.d3#
    • 1...Sf5
      • 2.Sf6#
    • 1...Sxc6
      • 2.Sf6#
    • 1...Seg6
      • 2.Sf6#
    • 1...Sc8
      • 2.Sf6#
    • 1...h3
      • 2.Sg3#
  • Tries
    • 1.Rb4+?
      • 1...Qd4
        • 2.Qf5#
      • 1...axb4!
  • Keys
    • 1.Sxd5!
      • threat
        • 2.Sc3#
        • 2.Sdf6#
      • 1...Qxd5
        • 2.Qf5#
      • 1...Sfxd5
        • 2.d3#
      • 1...Sxh5
        • 2.d3#
      • 1...Sexd5
        • 2.Sf6#
      • 1...Qc3
        • 2.Sxc3#
        • 2.Sdf6#
        • 2.Qf5#
      • 1...Qf6
        • 2.Sc3#
        • 2.Sdxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 15
  • Sets
    • Q(g);N_GUARD,P_SPINS(i)::QAB1(J)
    • Q(g);N_GUARD,P_PINR(E),P_SPINS(i)::QAB1(J)
    • Q(g);N_GUARD,P_SPINS(i)::QAB1(J),XQ(g)
    • S(c);N_GUARD::P(B)
    • S(i);P_PINQ(J),P_SPINQ(g)::S(F)
    • S(i);N_SPINP(f),P_PINQ(J),P_SPINQ(g),XB(G)::S(F)
    • P(d);N_GUARD::S(F)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • Q(g);P_SPINQ(g),P_SPINS(i)::QAB1(J)
      • Refutation
        • P(e);XR(E)
  • Actual
    • S(C);XP(f)
    • Threat
      • DUALS(2)
    • Vars
      • Q(g);N_GUARD,P_PINB(G),P_SPINQ(g),P_SPINS(i),XS(C)::QAB1(J)
      • S(c);N_GUARD,P_SPINS(c),XS(C)::P(B)
      • S(c);N_GUARD,XS(F)::P(B)
      • S(i);P_PINQ(J),P_SPINQ(g),P_SPINS(i),XS(C)::S(F)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).