MESON Chess Problem Database

Problem Display
PID: 51542 (4R1K1/7p/6P1/1p1pPk2/5r2/1Nn3R1/b2N1r2/2BQ3q w - - 0 1)

Ellerman, Arnoldo

The Guardian, 1963

4R1K1/7p/6P1/1p1pPk2/5r2/1Nn3R1/b2N1r2/2BQ3q

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qg2
      • 2.Qh5#
    • 1...Qe4
      • 2.Qh5#
    • 1...Qe1
      • 2.Qh5#
    • 1...Qf1
      • 2.Qh5#
    • 1...Qg1
      • 2.Qh5#
    • 1...Qh5
      • 2.Qxh5#
    • 1...Rg4
      • 2.Qxg4#
    • 1...Se4
      • 2.Sd4#
  • Tries
    • 1.Qc2+?
      • 1...Qe4
        • 2.Sd4#
      • 1...Se4
        • 2.Sd4#
        • 2.Qc8#
      • 1...Re4!
  • Keys
    • 1.Se4!
      • threat
        • 2.Sd6#
      • 1...Kxe4
        • 2.Qd3#
      • 1...Qxe4
        • 2.Qh5#
      • 1...Rxe4
        • 2.Rg5#
      • 1...Sxe4
        • 2.Sd4#
      • 1...dxe4
        • 2.Qd7#
      • 1...Rg4
        • 2.Qxg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • Q(a);N_GUARD::QAR2(B)
    • Q(a);N_GUARD::QAR2(B),XQ(a)
    • R(e);N_GUARD,P_PINP(G)::QAB1(B),XR(e)
    • S(d);S_CUTR(e)::S(D)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • Q(a);P_SPINQ(a)::S(D)
      • Refutation
        • R(e);P_SPINR(e)
  • Actual
    • S(C);
    • Threat
      • S(C)
    • Vars
      • K(h);OGATEB,S_FLIGHT,XS(C)::QAB1(B)
      • Q(a);N_GUARD,SBLOCK,XS(C)::QAR2(B)
      • R(e);SBLOCK,XS(C)::R1(E)
      • S(d);SBLOCK,XS(C)::S(D)
      • P(g);OGATE,P_PINS(D),SBLOCK,XS(C)::QAB(B)
      • R(e);N_GUARD,P_PINP(G)::QAB1(B),XR(e)
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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).