MESON Chess Problem Database

Problem Display
PID: 278207 (4br2/3R4/1K2n2n/1N2p2B/Rp1pk1p1/8/2P2Q2/1rB1N1b1 w - - 0 1)

Wiberg, Bertil

Stella Polaris, 1972

4br2/3R4/1K2n2n/1N2p2B/Rp1pk1p1/8/2P2Q2/1rB1N1b1

#2

9 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Sf5
      • 2.Qg2#
    • 1...Sf7
      • 2.Bg6#
    • 1...b3
      • 2.Sc3#
    • 1...d3
      • 2.Sc3#
      • 2.cxd3#
  • Tries
    • 1.Bg6+?
      • 1...Rf5
        • 2.Qg2#
      • 1...Sf5
        • 2.Qg2#
      • 1...Bxg6!
    • 1.Ra5?
      • threat
        • 2.Sd6#
      • 1...Sf5
        • 2.Qg2#
      • 1...Sf7
        • 2.Bg6#
      • 1...Sc5!
  • Keys
    • 1.c4!
      • threat
        • 2.Sd6#
      • 1...bxc4 ep
        • 2.Qc2#
      • 1...dxc4 ep
        • 2.Sxc3#
      • 1...Sf5
        • 2.Qg2#
      • 1...Sf7
        • 2.Bg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(i);SBLOCK,S_CUTR(k)::QAB(D)
    • S(i);N_GUARD,S_CUTB(j),S_CUTR(k)::B(G)
    • P(c);N_GUARD,P_SPINP(d)::S(F)
  • Tries
    • Try
      • B(G);CHECK
      • Vars
        • R(k);P_SPINR(k)::QAB(D)
        • S(i);P_SPINS(i)::QAB(D)
      • Refutation
        • B(j);XB(G)
    • Try
      • R(E);
      • Threat
        • S(F)
      • Vars
        • S(i);SBLOCK,S_CUTR(k)::QAB(D)
        • S(i);N_GUARD,S_CUTB(j),S_CUTR(k)::B(G)
      • Refutation
        • S(h);
  • Actual
    • P(C);
    • Threat
      • S(F)
    • Vars
      • P(c);EP,P_PINS(F),P_SPINP(d),XP(C)::QAB(D)
      • P(d);EP,N_GUARD,P_PINQ(D),P_SPINP(c),XP(C)::S(F),XP(d)
      • S(i);SBLOCK,S_CUTR(k)::QAB(D)
      • S(i);N_GUARD,S_CUTB(j),S_CUTR(k)::B(G)
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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).