MESON Chess Problem Database

Problem Display
PID: 59533 (6K1/8/2B5/2B3p1/1Qp1R1p1/Rqn2k2/b3pPr1/3n4 w - - 0 1)

Ellerman, Arnoldo

2nd Prize, Brisbane Courier, 1922-1923

6K1/8/2B5/2B3p1/1Qp1R1p1/Rqn2k2/b3pPr1/3n4

#2

7 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Rxc4#
    • 1...Qxb4
      • 2.Rxc4#
    • 1...Sb1
      • 2.Rxc4#
    • 1...Sa4
      • 2.Rxc4#
    • 1...Sb5
      • 2.Rxc4#
  • Tries
    • 1.Rxc4+?
      • 1...Sd5
        • 2.Bxd5#
      • 1...Se4!
  • Keys
    • 1.Qxc4!
      • threat
        • 2.Rf4#
      • 1...Qxc4+
        • 2.Rxc4#
      • 1...Qb8+
        • 2.Re8#
      • 1...Rxf2
        • 2.Re3#
      • 1...Sxf2
        • 2.Re3#
      • 1...Sxe4
        • 2.Qf7#
      • 1...Sd5
        • 2.Qxe2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 5
  • Sets
    • Q(e);P_SPINS(f)::B(F)+R(D),XP(h)
    • Q(e);P_SPINS(f),XQ(C)::B(F)+R(D),XP(h)
    • S(f);N_GUARD,P_SPINQ(e)::B(F)+R(D),XP(h)
  • Tries
    • Try
      • R(D);CHECK,P_SPINR(D),XP(h)
      • Vars
        • S(f);N_GUARD,N_PINR(D),P_SPINQ(e),P_SPINS(f)::B(F),XS(f)
      • Refutation
        • S(f);P_SPINQ(e),P_SPINS(f)
  • Actual
    • Q(C);P_SPINQ(C),XP(h)
    • Threat
      • B(F)+R(D),DCHECK
    • Vars
      • Q(e);CHECK,OGATE,P_SPINS(f),XQ(C)::B(F)+R(D),XQ(e)
      • Q(e);CHECK,P_SPINS(f)::B(F)+R(D)
      • R(d);SBLOCK,XP(A)::B(F)+R(D),DCHECK
      • S(a);SBLOCK,XP(A)::B(F)+R(D),DCHECK
      • S(f);P_SPINQ(e),P_SPINS(f),XR(D)::QAR(C)
      • S(f);N_PINQ(C),P_SPINQ(e)::QAB1(C),XP(c)
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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).