MESON Chess Problem Database

Problem Display
PID: 83470 (7K/4p3/4Q1p1/nNp1N3/4k1P1/3p1b2/p2P1P1B/qn6 w - - 0 1)

Ellerman, Arnoldo

3rd HM., Good Companions (October), 1916

7K/4p3/4Q1p1/nNp1N3/4k1P1/3p1b2/p2P1P1B/qn6

#2

8 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe5+
      • 2.Qxe5#
    • 1...Sc3
      • 2.Sc4#
      • 2.Sc6#
      • 2.Sxg6#
      • 2.Sd7#
      • 2.Sf7#
    • 1...Sb3
      • 2.Qc6#
    • 1...Sc4
      • 2.Qc6#
    • 1...Sc6
      • 2.Qxc6#
    • 1...Sb7
      • 2.Qc6#
  • Tries
    • 1.Sc3+?
      • 1...Kd4
        • 2.Sxf3#
      • 1...Sxc3
        • 2.Sc6#
      • 1...Qxc3!
    • 1.Sd6+?
      • 1...Kd4
        • 2.Sxf3#
      • 1...exd6!
  • Keys
    • 1.Sc7!
      • threat
        • 2.Qd5#
      • 1...Qxe5+
        • 2.Qxe5#
      • 1...Kd4
        • 2.Sxf3#
      • 1...Bxg4
        • 2.Qxg4#
      • 1...Qd4
        • 2.Qxg6#
      • 1...Sc3
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • Q(a);CHECK,OGATE,P_SPINQ(a),XS(F)::QAR1(G),XQ(a)
    • S(g);N_GUARD::QAB(G)
    • S(g);N_GUARD::QAB(G),XS(g)
  • Tries
    • Try
      • S(E);CHECK,N_SPINS(F)
      • Vars
        • K(f);P-FLIGHT::S(F),XB(e)
        • S(b);XS(E)::QAR(G)+S(F)
      • Refutation
        • Q(a);P_PINS(F),XS(E)
    • Try
      • S(E);CHECK
      • Vars
        • K(f);N_PINS(F),P-FLIGHT::S(F),XB(e)
      • Refutation
        • P(j);XS(E)
  • Actual
    • S(E);
    • Threat
      • QAB1(G)
    • Vars
      • Q(a);CHECK,OGATE,P_SPINQ(a),XS(F)::QAR1(G),XQ(a)
      • K(f);N_PINS(F),P-FLIGHT::S(F),XB(e)
      • B(e);OGATE,XP(D)::QAR2(G),XB(e)
      • Q(a);SBLOCK::QAB(G),XP(i)
      • S(b);N_PINS(F)::QAR(G)+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).