MESON Chess Problem Database

Problem Display
PID: 152293 (r6B/1Nb1Nn1p/1p2pP2/1n1Pk1P1/1p5R/1b1pP3/5P1K/4Q3 w - - 0 1)

Ellerman, Arnoldo

Good Companions (October), 1915

r6B/1Nb1Nn1p/1p2pP2/1n1Pk1P1/1p5R/1b1pP3/5P1K/4Q3

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Sa3
      • 2.Qa1#
    • 1...Sd4
      • 2.exd4#
    • 1...Sa7
      • 2.Qa1#
    • 1...Sd8
      • 2.f7#
  • Tries
    • 1.Qh1?
      • threat
        • 2.Re4#
        • 2.Qe4#
        • 2.f4#
      • 1...Bxd5
        • 2.f4#
      • 1...Sxg5
        • 2.f4#
      • 1...Ra2
        • 2.Re4#
        • 2.Qe4#
      • 1...Sc3
        • 2.f4#
      • 1...Sbd6
        • 2.f4#
      • 1...Sfd6
        • 2.f4#
      • 1...exd5!
  • Keys
    • 1.e4!
      • threat
        • 2.Sc6#
      • 1...Kd4+
        • 2.e5#
      • 1...Bxd5
        • 2.exd5#
      • 1...exd5
        • 2.exd5#
      • 1...Sd4
        • 2.f4#
      • 1...Sa7
        • 2.Qa1#
      • 1...Sd8
        • 2.f7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • S(d);N_GUARD,S_CUTR(k)::QAB(A)
    • S(d);OGATE::QAR(A)+P(D)DCHECK,XS(d)
    • S(i);OGATE::B(K)+P(H)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • B(a);XP(F)::P(B)
        • S(i);XP(G)::P(B)
        • S(d);::P(B)
        • S(i);::P(B)
      • Refutation
        • P(g);XP(F)
  • Actual
    • P(D);
    • Threat
      • S(J)
    • Vars
      • K(e);CHECK,OGATE,S_FLIGHT::R(E)+P(D)
      • B(a);OGATE,XP(F)::QAR(A)+P(D),XB(a)
      • P(g);OGATE,XP(F)::QAR(A)+P(D),XP(g)
      • S(d);SBLOCK::P(B)
      • S(d);N_GUARD,S_CUTR(k)::QAB(A)
      • S(i);OGATE::B(K)+P(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).