MESON Chess Problem Database

Problem Display
PID: 266230 (1B6/2qB4/1n1R4/4k3/1Qp3P1/4rpK1/5N2/b7 w - - 0 1)

di Scala, Pascal

diagrammes, 1976

1B6/2qB4/1n1R4/4k3/1Qp3P1/4rpK1/5N2/b7

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd6
      • 2.Qxd6#
    • 1...c3
      • 2.Qd4#
      • 2.Qf4#
  • Tries
    • 1.Sd3+?
      • 1...Ke4
        • 2.Bf5#
      • 1...cxd3
        • 2.Qf4#
      • 1...Rxd3!
    • 1.Qc5+?
      • 1...Sd5
        • 2.Re6#
        • 2.Qxd5#
      • 1...Qxc5!
  • Keys
    • 1.Qd2!
      • threat
        • 2.Re6#
      • 1...Qxd6
        • 2.Qxd6#
      • 1...Qxd7
        • 2.Qxe3#
      • 1...Sxd7
        • 2.Qd5#
      • 1...Rd3
        • 2.Qf4#
      • 1...Bd4
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(g);OGATE,P_SPINQ(g),XR(E)::QAB1(C),XQ(g)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • K(e);P-FLIGHT,P_PINR(E),P_SPINP(d),S_CUTR(b)::B(F)
        • P(d);OGATE,XS(A)::QAB1(C)
      • Refutation
        • R(b);XS(A)
    • Try
      • Q(C);CHECK
      • Refutation
        • Q(g);XQ(C)
  • Actual
    • Q(C);
    • Threat
      • R1(E)
    • Vars
      • Q(g);OGATE,P_SPINQ(g),XR(E)::QAB1(C),XQ(g)
      • Q(g);XB(F)::QAR2(C),XR(b)
      • S(f);N_GUARD,XB(F)::QAR1(C)
      • R(b);OGATE::QAB1(C)
      • B(a);N_GUARD::QAB1(C),XB(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).