MESON Chess Problem Database

Problem Display
PID: 21419 (3n4/1p1QB1bq/3N3r/nK2k3/P1pNpp2/1p3b2/3R4/8 w - - 0 1)

Ellerman, Arnoldo

BCPJ, 1919

3n4/1p1QB1bq/3N3r/nK2k3/P1pNpp2/1p3b2/3R4/8

#2

7 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qf5
      • 2.Qxf5#
    • 1...Qg8
      • 2.Qf5#
    • 1...Qh8
      • 2.Qf5#
    • 1...Rxd6
      • 2.Qxd6#
    • 1...Rg6
      • 2.Qf5#
    • 1...Sac6
      • 2.Sxc4#
    • 1...Sdc6
      • 2.Sf7#
    • 1...Se6
      • 2.Sf7#
    • 1...Sf7
      • 2.Sxf7#
    • 1...e3
      • 2.Sxf3#
  • Tries
    • 1.Sc6+?
      • 1...Saxc6
        • 2.Sxc4#
      • 1...Sdxc6
        • 2.Sf7#
      • 1...bxc6+!
  • Keys
    • 1.Kb6!
      • threat
        • 2.Qb5#
      • 1...Rxd6+
        • 2.Qxd6#
      • 1...Kd5
        • 2.Qb5#
      • 1...Qg8
        • 2.Qf5#
      • 1...Sac6
        • 2.Sxc4#
      • 1...Sdc6
        • 2.Sf7#
      • 1...Se6
        • 2.Sf7#
      • 1...e3
        • 2.Sxf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • Q(k);N_GUARD::QAR1(F),XQ(k)
    • Q(k);N_GUARD::QAR1(F)
    • R(h);OGATE,XS(E)::QAB1(F),XR(h)
    • R(h);S_CUTQ(k)::QAR1(F)
    • S(f);N_GUARD::S(E),XP(c)
    • S(l);N_GUARD::S(E)
    • S(l);N_GUARD::S(E),XS(l)
    • P(d);N_GUARD::S(C),XB(b)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • S(f);XS(C)::S(E),XP(c)
        • S(l);XS(C)::S(E)
      • Refutation
        • P(i);CHECK,XS(C)
  • Actual
    • K(D);P-FLIGHT,P_SPINS(E)
    • Threat
      • QAR(F)
    • Vars
      • R(h);CHECK,OGATE,XS(E)::QAB1(F),XR(h)
      • K(g);P-FLIGHT::QAR2(F)
      • Q(k);N_GUARD::QAR1(F)
      • S(f);N_PINS(E)::S(E),XP(c)
      • S(l);N_PINS(E)::S(E)
      • P(d);N_GUARD::S(C),XB(b)
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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).