MESON Chess Problem Database

Problem Display
PID: 261980 (qr2Q2b/2n1N2K/1n1p2B1/7R/1P1k1P2/N1ppp3/8/8 w - - 0 1)

Jonsson, Nils Gustav Helmer

Problemnoter, 1965

qr2Q2b/2n1N2K/1n1p2B1/7R/1P1k1P2/N1ppp3/8/8

#2

8 + 10

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qc6
      • 2.Sxc6#
    • 1...Qa5
      • 2.Sc6#
    • 1...Qa6
      • 2.Sc6#
    • 1...Qa7
      • 2.Sc6#
    • 1...Rb7
      • 2.Sc6#
    • 1...Sbd5
      • 2.Sf5#
    • 1...Sc8
      • 2.Qxh8#
    • 1...Scd5
      • 2.Sf5#
    • 1...d5
      • 2.Sf5#
  • Tries
    • 1.Rd5+?
      • 1...Sbxd5
        • 2.Sf5#
      • 1...Scxd5
        • 2.Sf5#
      • 1...Qxd5!
  • Keys
    • 1.Qc6!
      • threat
        • 2.Sf5#
      • 1...Qxc6
        • 2.Sxc6#
      • 1...Qa5
        • 2.Qe4#
      • 1...Rf8
        • 2.Qxb6#
      • 1...Sbd5
        • 2.Qc4#
      • 1...Scd5
        • 2.Sb5#
      • 1...d2
        • 2.Sc2#
      • 1...d5
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(h);N_GUARD::S(F),XQ(h)
    • Q(h);N_GUARD::S(F)
    • R(i);S_CUTQ(h)::S(F)
    • S(e);SBLOCK::S(F)
    • S(e);S_CUTR(i)::QAB(H),XB(j)
    • S(g);SBLOCK::S(F)
    • P(f);SBLOCK::S(F)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • S(e);SBLOCK,XR(D)::S(F)
        • S(g);SBLOCK,XR(D)::S(F)
      • Refutation
        • Q(h);XR(D)
  • Actual
    • Q(H);
    • Threat
      • S(F)
    • Vars
      • Q(h);XQ(H)::S(F),XQ(h)
      • Q(h);N_GUARD::QAR1(H)
      • R(i);N_GUARD::QAB(H),XS(e)
      • S(e);N_GUARD::QAR1(H)
      • S(g);N_GUARD::S(A)
      • P(b);N_GUARD::S(A)
      • P(f);N_GUARD::QAB1(H)
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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).