MESON Chess Problem Database

Problem Display
PID: 109917 (2NR1n2/2r5/K1kBp3/n1p5/2P3p1/4N1q1/2p5/2Qb4 w - - 0 1)

Peixoto, RA

Caissa, 1980

2NR1n2/2r5/K1kBp3/n1p5/2P3p1/4N1q1/2p5/2Qb4

#2

7 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd6
      • 2.Rxd6#
    • 1...Ra7+
      • 2.Sxa7#
    • 1...Re7
      • 2.Sxe7#
    • 1...Sb7
      • 2.Sa7#
  • Keys
    • 1.Qa3!
      • threat
        • 2.Qxc5#
        • 2.Qa4#
      • 1...Ra7+
        • 2.Sxa7#
      • 1...Qxd6
        • 2.Rxd6#
        • 2.Qa4#
      • 1...Qxe3
        • 2.Qa4#
      • 1...c1Q
        • 2.Qxc5#
      • 1...c1S
        • 2.Qxc5#
      • 1...c1B
        • 2.Qxc5#
      • 1...c1R
        • 2.Qxc5#
      • 1...Qe5
        • 2.Qa4#
      • 1...Rb7
        • 2.Qxc5#
      • 1...Sb3
        • 2.Qa4#
      • 1...Sb7
        • 2.Sa7#
        • 2.Qa4#
      • 1...Sd7
        • 2.Qa4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 3
  • Sets
    • Q(c);OGATE,XB(E)::R1(G),XQ(c)
    • R(i);CHECK,N_GUARD::S(F),XR(i)
    • R(i);N_GUARD::S(F),XR(i)
    • S(e);S_CUTR(i)::S(F)
  • Actual
    • Q(A);
    • Threat
      • DUALS(2)
    • Vars
      • R(i);CHECK,N_GUARD::S(F),XR(i)
      • Q(c);XS(B)::QAB(A)
      • P(b);::QAR1(A),XP(f)
      • Q(c);::QAB(A)
      • R(i);::QAR1(A),XP(f)
      • S(e);::QAB(A)
      • S(j);::QAB(A)
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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).