MESON Chess Problem Database

Problem Display
PID: 35903 (4R3/B3q3/B4N2/3p3N/1b1P3K/2P1k2P/1Q3pP1/2nr4 w - - 0 1)

Easter, Norris

3rd HM., BCF 001. Ty., 1929-1930

4R3/B3q3/B4N2/3p3N/1b1P3K/2P1k2P/1Q3pP1/2nr4

#2

11 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4+
      • 2.Sg4#
    • 1...Qe5
      • 2.Rxe5#
    • 1...Qe6
      • 2.Rxe6#
    • 1...Rxd4+
      • 2.Bxd4#
    • 1...Bxc3
      • 2.Rxe7#
    • 1...Ba5
      • 2.Rxe7#
    • 1...Sa2
      • 2.Qe2#
    • 1...Se2
      • 2.Qxe2#
    • 1...Sb3
      • 2.Qe2#
  • Keys
    • 1.Sf4!
      • threat
        • 2.Sxd5#
      • 1...Kxf4
        • 2.Qxf2#
      • 1...Rxd4
        • 2.Qxc1#
      • 1...Qe4
        • 2.Sxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • Q(g);CHECK,N_PINS(I)::S(I)
    • Q(g);N_PINS(I),OGATE::R(K),XQ(g)
    • R(b);CHECK,OGATE,P_SPINR(b),XP(E)::B(J),XR(b)
    • B(e);N_GUARD,XP(C)::R(K),XQ(g)
    • B(e);N_GUARD::R(K),XQ(g)
    • S(a);N_GUARD::QAR1(A)
    • S(a);N_GUARD::QAR1(A),XS(a)
  • Actual
    • S(G);
    • Threat
      • S(G),XP(f)
    • Vars
      • K(d);N_SPINQ(g),S_FLIGHT,XS(G)::QAR2(A),XP(c)
      • R(b);N_GUARD,N_PINS(I),P_PINS(G),P_SPINR(b),XP(E)::QAB(A),XS(a)
      • Q(g);N_PINS(I),P_PINS(G)::S(I),XP(f)
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).