MESON Chess Problem Database

Problem Display
PID: 207758 (4R1b1/4q2r/r6p/p1Q2p2/2PNk2b/K1P5/4Pp1B/3n1N2 w - - 0 1)

Ozbey, Y Emre

The Problemist, 1984

4R1b1/4q2r/r6p/p1Q2p2/2PNk2b/K1P5/4Pp1B/3n1N2

#2

9 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5
      • 2.Rxe5#
      • 2.Qxe5#
    • 1...Qe6
      • 2.Qd5#
      • 2.Qxf5#
    • 1...Qxe8
      • 2.Qxf5#
    • 1...Rd6
      • 2.Qxf5#
    • 1...Se3
      • 2.Sd2#
  • Tries
    • 1.Bd6?
      • threat
        • 2.Qxf5#
      • 1...Qe5
        • 2.Qxe5#
      • 1...Rf7
        • 2.Qd5#
      • 1...Bd5
        • 2.Qxd5#
      • 1...Be6
        • 2.Qe5#
      • 1...Se3
        • 2.Sd2#
      • 1...f4
        • 2.Qf5#
      • 1...Sxc3!
    • 1.Rxe7+?
      • 1...Re6
        • 2.Qd5#
        • 2.Qxf5#
        • 2.Qc6#
      • 1...Rxe7
        • 2.Qxf5#
      • 1...Be6
        • 2.Qd5#
        • 2.Qe5#
        • 2.Qxf5#
      • 1...Bxe7!
  • Keys
    • 1.Se6!
      • threat
        • 2.Sd2#
      • 1...Qxc5+
        • 2.Sxc5#
      • 1...Rd6
        • 2.Qe5#
      • 1...Qg5
        • 2.Sxg5#
        • 2.Qd4#
        • 2.Qd5#
        • 2.Qe5#
      • 1...Qd6
        • 2.Sg5#
      • 1...Qd8
        • 2.Sg5#
        • 2.Qe5#
      • 1...Qd7
        • 2.Sg5#
        • 2.Qe5#
      • 1...Bg5
        • 2.Sg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(i);N_PINQ(H),N_SPINQ(i),XR(I)::QAB1(H),XP(f)
    • R(g);N_PINQ(H)::QAB1(H),XP(f)
    • S(a);SBLOCK::S(A)
  • Tries
    • Try
      • B(C);N_SPINQ(H)
      • Threat
        • QAB1(H),XP(f)
      • Vars
        • Q(i);N_GUARD::QAR1(H),XQ(i)
        • R(j);S_CUTB(k)::QAB1(H)
        • B(k);N_GUARD::QAB1(H),XB(k)
        • B(k);N_SPINQ(i),S_CUTQ(i)::QAR1(H)
        • S(a);SBLOCK::S(A)
        • P(f);::QAB1(H)
      • Refutation
        • S(a);XP(E)
    • Try
      • R(I);CHECK,N_SPINQ(H),XQ(i)
      • Vars
        • R(j);XR(I)::QAB1(H),XP(f)
      • Refutation
        • B(d);P_PINQ(H),XR(I)
  • Actual
    • S(G);N_PINQ(i)
    • Threat
      • S(A)
    • Vars
      • Q(i);CHECK,XQ(H)::R(I)+S(G),DCHECK,XQ(i)
      • R(g);N_PINQ(H)::QAR1(H)
      • Q(i);::R(I)+S(G),DCHECK
      • B(d);N_GUARD::S(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).