MESON Chess Problem Database

Problem Display
PID: 57205 (B1b3N1/4R1p1/1P1kppq1/4n3/1P2Qnr1/2P3B1/3N4/1K6 w - - 0 1)

Ellerman, Arnoldo

3rd Highly Comm., Brisbane Courier, 1918

B1b3N1/4R1p1/1P1kppq1/4n3/1P2Qnr1/2P3B1/3N4/1K6

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe4+
      • 2.Sxe4#
    • 1...Se2
      • 2.Sc4#
    • 1...Sg2
      • 2.Sc4#
    • 1...Sfd3
      • 2.Sc4#
      • 2.Qc6#
    • 1...Sh3
      • 2.Sc4#
    • 1...Sd5
      • 2.Sc4#
    • 1...Sh5
      • 2.Sc4#
    • 1...Sed3
      • 2.Sc4#
      • 2.Qd4#
    • 1...Sf3
      • 2.Sc4#
    • 1...Sc4
      • 2.Sxc4#
    • 1...Sc6
      • 2.Sc4#
    • 1...Sd7
      • 2.Sc4#
      • 2.Rxe6#
    • 1...Sf7
      • 2.Sc4#
  • Keys
    • 1.c4!
      • threat
        • 2.c5#
      • 1...Qxe4+
        • 2.Sxe4#
      • 1...Sxc4
        • 2.Sxc4#
      • 1...Sfd3
        • 2.Qc6#
      • 1...Sed3
        • 2.Qd4#
      • 1...Sd7
        • 2.Rxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • Q(g);CHECK,XQ(F)::S(B),XQ(g)
    • S(a);P_SPINS(c)::S(B)
    • S(c);N_GUARD,P_SPINS(a)::S(B)
    • S(c);N_GUARD,P_SPINS(a)::S(B),XS(c)
  • Actual
    • P(C);
    • Threat
      • P(C)
    • Vars
      • Q(g);CHECK,XQ(F)::S(B),XQ(g)
      • S(c);P_SPINS(a),XP(C)::S(B),XS(c)
      • S(a);N_PINQ(F),P_SPINS(c)::QAR1(F)
      • S(c);N_PINQ(F),P_SPINS(a)::QAR2(F)
      • S(c);P_SPINS(a),SBLOCK,S_CUTB(i)::R1(H),XP(e)
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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).