MESON Chess Problem Database

Problem Display
PID: 58855 (8/pP1p4/Qp6/2kBRN2/1rN1n2K/B2P3p/4rn2/b2q4 w - - 0 1)

Ellerman, Arnoldo

1st Prize, Brisbane Courier, 1921

8/pP1p4/Qp6/2kBRN2/1rN1n2K/B2P3p/4rn2/b2q4

#2

9 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...b5
      • 2.Qxa7#
  • Tries
    • 1.Bc6+?
      • 1...Bxe5
        • 2.Qb5#
      • 1...d5
        • 2.Qb5#
      • 1...Kxc6!
    • 1.Qa5+?
      • 1...b5
        • 2.Bxb4#
        • 2.Qxb4#
        • 2.Qc7#
        • 2.Qxa7#
      • 1...bxa5!
  • Keys
    • 1.Sb2!
      • threat
        • 2.Qc4#
      • 1...Sd2+
        • 2.d4#
      • 1...Sd6+
        • 2.Be4#
      • 1...Qxd3
        • 2.Sa4#
      • 1...Qc2
        • 2.d4#
      • 1...Qb3
        • 2.d4#
      • 1...Qc1
        • 2.Sa4#
        • 2.d4#
      • 1...Rc2
        • 2.Sa4#
      • 1...b5
        • 2.Qxa7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • P(i);OGATEB,SBLOCK::QAB(H),XP(j)
  • Tries
    • Try
      • B(E);CHECK
      • Vars
        • B(a);XR(F)::QAR1(H)
        • P(k);P_SPINP(k)::QAR1(H)
      • Refutation
        • K(h);N_SPINR(f),P-FLIGHT,P_SPINP(i),XB(E)
    • Try
      • Q(H);CHECK
      • Refutation
        • P(i);XQ(H)
  • Actual
    • S(C);
    • Threat
      • QAR1(H)
    • Vars
      • S(g);CHECK,S_CUTQ(b)::P(B)
      • S(g);CHECK,S_CUTP(k)::R(F)+B(E)
      • Q(b);N_GUARD,XP(B)::S(C)
      • Q(b);N_GUARD::P(B)
      • R(c);S_CUTQ(b)::S(C)
      • P(i);OGATEB,SBLOCK::QAB(H),XP(j)
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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).