MESON Chess Problem Database

Problem Display
PID: 170928 (8/N5p1/Rn1Ppb2/prpk2pQ/bpp5/4PP2/3N3B/3R2KB w - - 0 1)

Ellerman, Arnoldo

Problemisten, 1947

8/N5p1/Rn1Ppb2/prpk2pQ/bpp5/4PP2/3N3B/3R2KB

#2

11 + 12

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Be7
      • 2.Sb3#
    • 1...Bd8
      • 2.Sb3#
    • 1...Sd7
      • 2.f4#
    • 1...Sa8
      • 2.f4#
    • 1...Sc8
      • 2.f4#
  • Tries
    • 1.Qf7?
      • threat
        • 2.Qb7#
      • 1...Be7
        • 2.Sb3#
      • 1...Sd7
        • 2.f4#
      • 1...Sa8
        • 2.f4#
      • 1...Sc8
        • 2.f4#
      • 1...Be5!
    • 1.Qxg5+?
      • 1...Be5
        • 2.Sb3#
        • 2.Qxe5#
      • 1...Bxg5
        • 2.Sb3#
      • 1...e5!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Qc6#
      • 1...e5
        • 2.Sb3#
      • 1...Sd7
        • 2.f4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • B(k);N_GUARD::R(A)+S(D)
    • S(i);::B(C)+P(G)
  • Tries
    • Try
      • Q(H);N_PINP(h),P_PINP(j)
      • Threat
        • QAB(H)
      • Vars
        • B(k);N_GUARD::R(A)+S(D)
        • S(i);::B(C)+P(G)
      • Refutation
        • B(k);
    • Try
      • Q(H);CHECK,XP(h)
      • Vars
        • B(k);XQ(H)::R(A)+S(D)
      • Refutation
        • P(j);P_SPINP(j)
  • Actual
    • Q(H);N_PINP(h)
    • Threat
      • QAB1(H)
    • Vars
      • P(j);S_CUTB(k)::R(A)+S(D)
      • S(i);::B(C)+P(G)
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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).