MESON Chess Problem Database

Problem Display
PID: 206503 (7Q/K3pB1R/1NpbPn2/4k1p1/1nR3P1/3p4/6b1/8 w - - 0 1)

Ivanitski, ?

64 Shakhmatnoe obozrenie, 1925

7Q/K3pB1R/1NpbPn2/4k1p1/1nR3P1/3p4/6b1/8

#2

8 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bd5
      • 2.Sd7#
    • 1...Bb8+
      • 2.Qxb8#
    • 1...Sd5
      • 2.Sd7#
  • Tries
    • 1.Rg7?
      • threat
        • 2.Rxg5#
        • 2.Qh2#
      • 1...Bb8+
        • 2.Qxb8#
      • 1...Sxg4
        • 2.Rxg5#
      • 1...Be4
        • 2.Qh2#
      • 1...Bc5
        • 2.Qh2#
      • 1...Bc7
        • 2.Qh2#
      • 1...Sfd5
        • 2.Sd7#
        • 2.Rxg5#
      • 1...Sh5
        • 2.Rxg5#
      • 1...Sd7
        • 2.Rxg5#
      • 1...Sh7
        • 2.Rxg5#
        • 2.Rxh7#
      • 1...Se8
        • 2.Rxg5#
      • 1...Sg8
        • 2.Rxg5#
        • 2.Rxg8#
      • 1...Bh3
        • 2.Rxg5#
      • 1...Sbd5
        • 2.Rxg5#
      • 1...Se4!
    • 1.Qxf6+?
      • 1...Kxf6
        • 2.Sd7#
      • 1...exf6!
  • Keys
    • 1.Rh1!
      • threat
        • 2.Qh2#
      • 1...Bb8+
        • 2.Qxb8#
      • 1...Bh3
        • 2.Re1#
      • 1...Sd5
        • 2.Sd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • B(a);SBLOCK::S(C)
    • B(g);CHECK,OGATEB::QAB(H),XB(g)
    • S(c);SBLOCK::S(C)
  • Tries
    • Try
      • R(G);N_PINS(h)
      • Threat
        • DUALS(2)
      • Vars
        • B(g);CHECK,OGATEB::QAB(H),XB(g)
        • S(h);XP(B)::QAB(H)+R(G),DCHECK,XP(e)
        • B(a);::QAB(H)
        • B(g);P_PINS(C)::QAB(H)
        • B(g);::QAB(H)
        • S(h);::QAB(H)+R(G),DCHECK,XP(e)
        • B(a);::R(G),XP(e)
        • S(c);::R(G),XP(e)
      • Refutation
        • S(h);
    • Try
      • Q(H);CHECK,XS(h)
      • Vars
        • K(d);S_FLIGHT,XQ(H)::S(C)
      • Refutation
        • P(i);XQ(H)
  • Actual
    • R(G);
    • Threat
      • QAB(H)
    • Vars
      • B(g);CHECK,OGATEB::QAB(H),XB(g)
      • B(a);N_GUARD::R(G)
      • S(c);SBLOCK::S(C)
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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).