MESON Chess Problem Database

Problem Display
PID: 259436 (3R4/B7/Kb6/p3p3/2kPNn2/8/N7/n2Q4 w - - 0 1)

Cheylan, Yves

3rd Prize, Arbeiter Zeitung, 1980

3R4/B7/Kb6/p3p3/2kPNn2/8/N7/n2Q4

#2

7 + 6

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sc2
      • 2.Qxc2#
    • 1...Sb3
      • 2.Qc2#
    • 1...Sd3
      • 2.Sd2#
    • 1...Sd5
      • 2.Sd6#
  • Tries
    • 1.Qb1?
      • threat
        • 2.Sd2#
        • 2.Qb5#
      • 1...Bxd8
        • 2.Qb5#
      • 1...exd4
        • 2.Qb5#
      • 1...Sc2
        • 2.Qxc2#
        • 2.Qb5#
      • 1...Sb3
        • 2.Qc2#
      • 1...Sd5!
    • 1.Qd3+?
      • 1...Sxd3
        • 2.Sd2#
      • 1...Kxd3!
  • Keys
    • 1.dxe5!
      • threat
        • 2.Qa4#
      • 1...Bxd8
        • 2.Sd6#
      • 1...Sc2
        • 2.Qxc2#
      • 1...Bd4
        • 2.Rxd4#
      • 1...Bc5
        • 2.Sd2#
      • 1...Sb3
        • 2.Qc2#
      • 1...Sd3
        • 2.Qxd3#
      • 1...Sd5
        • 2.Qxd5#
      • 1...a4
        • 2.Qxa4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAR2(A),XS(a)
    • S(a);N_GUARD::QAR2(A)
    • S(c);SBLOCK::S(D)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • B(f);XR(G)::QAB1(A)
        • P(e);XP(C)::QAB1(A)
        • S(a);N_GUARD::QAR2(A)
      • Refutation
        • S(c);
    • Try
      • Q(A);CHECK
      • Vars
        • S(c);SBLOCK,XQ(A)::S(D)
      • Refutation
        • K(b);S_FLIGHT,XQ(A)
  • Actual
    • P(C);XP(e)
    • Threat
      • QAR2(A)
    • Vars
      • B(f);XR(G)::S(D)
      • S(a);N_GUARD::QAR2(A),XS(a)
      • B(f);N_GUARD::R1(G),XB(f)
      • B(f);::S(D)
      • S(a);N_GUARD::QAR2(A)
      • S(c);N_GUARD::QAB1(A),XS(c)
      • P(d);::QAR2(A),XP(d)
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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).