MESON Chess Problem Database

Problem Display
PID: 139281 (5Q2/8/4R3/1N2q3/3r4/1Rr1kB2/8/4NK2 w - - 0 1)

Quack, Godfrey C

Die Schwalbe, 1966

5Q2/8/4R3/1N2q3/3r4/1Rr1kB2/8/4NK2

#2

7 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4
      • 2.Qh6#
    • 1...Rd1
      • 2.Qh6#
    • 1...Rd2
      • 2.Rxe5#
      • 2.Qh6#
    • 1...Rd3
      • 2.Qh6#
    • 1...Rd5
      • 2.Qh6#
    • 1...Rd6
      • 2.Qh6#
    • 1...Rd7
      • 2.Qh6#
    • 1...Rd8
      • 2.Qh6#
  • Tries
    • 1.Rb2?
      • threat
        • 2.Re2#
      • 1...Rd2
        • 2.Rxe5#
        • 2.Qh6#
      • 1...Rc2!
    • 1.Rxc3+?
      • 1...Rd3
        • 2.Rxd3#
        • 2.Qh6#
      • 1...Kd2!
    • 1.Rxe5+?
      • 1...Re4
        • 2.Qh6#
      • 1...Kd2!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Qxd4#
      • 1...Kd2
        • 2.Qxc3#
      • 1...Kf4
        • 2.Qxe5#
      • 1...Qe4
        • 2.Qg5#
      • 1...Rd3
        • 2.Qc1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • Q(d);S_CUTR(c)::QAB(G)
    • R(c);N_GUARD,P_PINS(A)::QAB(G)
    • R(c);N_GUARD,N_SPINR(a)::QAB(G)
    • R(c);N_GUARD::QAB(G)
  • Tries
    • Try
      • R(C);N_PINR(a)
      • Threat
        • R1(C)
      • Refutation
        • R(a);
    • Try
      • R(C);CHECK,XR(a)
      • Refutation
        • K(b);N_SPINQ(d),S_FLIGHT
    • Try
      • R(F);CHECK,XQ(d)
      • Vars
        • R(c);::QAB(G)
      • Refutation
        • K(b);N_SPINR(a),S_FLIGHT
  • Actual
    • Q(G);
    • Threat
      • QAB1(G),XR(c)
    • Vars
      • K(b);N_SPINQ(d),N_SPINR(a),S_FLIGHT::QAB1(G),XR(a)
      • K(b);N_SPINQ(d),N_SPINR(a),S_FLIGHT::QAB1(G),XQ(d)
      • Q(d);OGATE::QAB(G)
      • R(a);OGATE::QAB(G)
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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).