MESON Chess Problem Database

Problem Display
PID: 259450 (8/8/8/B5RK/k7/pp1np3/8/5Q2 w - - 0 1)

Cheylan, Yves

Die Schwalbe, 1985

8/8/8/B5RK/k7/pp1np3/8/5Q2

#2

4 + 5

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sc1
      • 2.Qc4#
      • 2.Qb5#
      • 2.Qf4#
    • 1...Se1
      • 2.Qc4#
      • 2.Qb5#
      • 2.Qf4#
    • 1...Sb2
      • 2.Qb5#
    • 1...Sf2
      • 2.Qc4#
      • 2.Qb5#
    • 1...Sb4
      • 2.Qb5#
    • 1...Sf4+
      • 2.Qxf4#
    • 1...b2
      • 2.Qd1#
  • Tries
    • 1.Be1?
      • threat
        • 2.Ra5#
      • 1...Sf4+
        • 2.Qxf4#
      • 1...Sxe1
        • 2.Qc4#
        • 2.Qb5#
        • 2.Qf4#
      • 1...Sb4
        • 2.Qb5#
      • 1...Sc5
        • 2.Qc4#
      • 1...Se5
        • 2.Qa6#
      • 1...b2!
    • 1.Bd2?
      • threat
        • 2.Ra5#
      • 1...Sf4+
        • 2.Qxf4#
      • 1...b2
        • 2.Qd1#
      • 1...Sb4
        • 2.Qb5#
      • 1...Sc5
        • 2.Qc4#
      • 1...Se5
        • 2.Qa6#
      • 1...exd2!
    • 1.Qxd3?
      • threat
        • 2.Qc4#
        • 2.Qe4#
        • 2.Qb5#
        • 2.Qd4#
        • 2.Qd7#
      • 1...b2
        • 2.Qc2#
        • 2.Qc4#
        • 2.Qb5#
        • 2.Qd1#
      • 1...a2!
    • 1.Qf4+?
      • 1...Sb4
        • 2.Qxb4#
      • 1...Sxf4+!
  • Keys
    • 1.Bc3!
      • threat
        • 2.Ra5#
      • 1...Sf4+
        • 2.Qxf4#
      • 1...b2
        • 2.Qd1#
      • 1...Sb4
        • 2.Qb5#
      • 1...Sc5
        • 2.Qc4#
      • 1...Se5
        • 2.Qa6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(c);OGATE::QAB1(A)
    • S(c);CHECK,N_GUARD::QAR(A),XS(c)
    • P(b);OGATEB::QAB(A)
  • Tries
    • Try
      • B(B);
      • Threat
        • R1(C)
      • Vars
        • S(c);CHECK,N_GUARD::QAR(A),XS(c)
        • S(c);OGATE::QAB1(A)
        • S(c);OGATE::QAR2(A)
      • Refutation
        • P(b);
    • Try
      • B(B);
      • Threat
        • R1(C)
      • Vars
        • S(c);CHECK,N_GUARD::QAR(A),XS(c)
        • P(b);OGATEB::QAB(A)
        • S(c);OGATE::QAB1(A)
        • S(c);OGATE::QAR2(A)
      • Refutation
        • P(d);XB(B)
    • Try
      • Q(A);XS(c)
      • Threat
        • DUALS(5)
      • Refutation
        • P(a);
    • Try
      • Q(A);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAR1(A),XS(c)
      • Refutation
        • S(c);CHECK,XQ(A)
  • Actual
    • B(B);
    • Threat
      • R1(C)
    • Vars
      • S(c);CHECK,N_GUARD::QAR(A),XS(c)
      • P(b);OGATEB::QAB(A)
      • S(c);OGATE::QAB1(A)
      • S(c);OGATE::QAR2(A)
HTML5 logo

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).