MESON Chess Problem Database

Problem Display
PID: 246395 (3N2BB/8/1qQ1P2K/3nrpN1/1Pbkn2R/2p5/2Pb1P2/3R4 w - - 0 1)

Hjelle, David

Sjakk-Nytt, 1946

3N2BB/8/1qQ1P2K/3nrpN1/1Pbkn2R/2p5/2Pb1P2/3R4

#2

12 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qc5
      • 2.Qxc5#
    • 1...Qxd8
      • 2.Qc5#
    • 1...Qa6
      • 2.Qc5#
    • 1...Qxc6
      • 2.Sxc6#
    • 1...Qb7
      • 2.Qc5#
    • 1...Qb8
      • 2.Qc5#
    • 1...Se3
      • 2.Sf3#
    • 1...Sf4
      • 2.Sf3#
    • 1...f4
      • 2.Sf3#
  • Tries
    • 1.Rxd2+?
      • 1...Bd3
        • 2.Sf3#
        • 2.Rxd3#
      • 1...cxd2!
  • Keys
    • 1.e7!
      • threat
        • 2.Se6#
      • 1...Qxc6+
        • 2.Sxc6#
      • 1...Qxd8
        • 2.Qc5#
      • 1...Sxb4
        • 2.Qxb6#
      • 1...Sxe7
        • 2.Qxb6#
      • 1...Se3
        • 2.Sf3#
        • 2.Qxb6#
      • 1...Sf4
        • 2.Sf3#
      • 1...Sf6
        • 2.Qxc4#
      • 1...Sc7
        • 2.Qxb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • Q(i);N_GUARD::QAB1(G),XQ(i)
    • Q(i);N_GUARD,XS(J)::QAB1(G)
    • Q(i);N_GUARD::QAB1(G)
    • Q(i);P_PINP(H),XQ(G)::S(J),XQ(i)
    • S(f);N_PINS(F)::S(F)
    • S(f);N_PINS(F),N_SPINS(e)::S(F)
    • P(h);N_PINS(F),N_SPINS(e)::S(F)
  • Tries
    • Try
      • R(A);CHECK,N_SPINS(F),XB(a)
      • Refutation
        • P(b);XR(A)
  • Actual
    • P(H);P_SPINQ(G)
    • Threat
      • S(J)
    • Vars
      • Q(i);CHECK,XQ(G)::S(J),XQ(i)
      • Q(i);N_PINQ(G),XS(J)::QAB1(G)
      • S(f);N_GUARD,XP(D)::QAB(G),XQ(i)
      • S(f);N_GUARD,XP(H)::QAB(G),XQ(i)
      • S(f);N_PINS(F),N_SPINS(e)::S(F)
      • S(f);N_PINQ(G),N_SPINR(g)::QAR1(G),XB(c)
      • S(f);N_GUARD::QAB(G),XQ(i)
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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).