MESON Chess Problem Database

Problem Display
PID: 261544 (3n4/3K2Nr/3N4/1R3R2/b2k4/3Bb2q/1PP2n2/6Q1 w - - 0 1)

Johner, Hans

Neue Zurcher Zeitung, 1958

3n4/3K2Nr/3N4/1R3R2/b2k4/3Bb2q/1PP2n2/6Q1

#2

9 + 7

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qf1
      • 2.Rd5#
    • 1...Qxf5+
      • 2.Sxf5#
    • 1...Qh2
      • 2.Rd5#
    • 1...Qg3
      • 2.Rd5#
    • 1...Qh4
      • 2.Rd5#
    • 1...Qh6
      • 2.Rd5#
    • 1...Rxg7+
      • 2.Qxg7#
    • 1...Bxc2
      • 2.Rd5#
    • 1...Bxb5+
      • 2.Sxb5#
    • 1...Sxd3
      • 2.c3#
    • 1...Sg4
      • 2.Rf4#
      • 2.Rd5#
    • 1...Sc6
      • 2.Rd5#
    • 1...Se6
      • 2.Rd5#
    • 1...Sf7
      • 2.Se6#
  • Keys
    • 1.Qg3!
      • threat
        • 2.Qe5#
      • 1...Qxf5+
        • 2.Sxf5#
      • 1...Rxg7+
        • 2.Qxg7#
      • 1...Bxb5+
        • 2.Sxb5#
      • 1...Qxg3
        • 2.Rd5#
      • 1...Bxc2
        • 2.Rd5#
      • 1...Sxd3
        • 2.c3#
      • 1...Qh2
        • 2.Rd5#
      • 1...Bf4
        • 2.c3#
      • 1...Sg4
        • 2.Rd5#
      • 1...Sc6
        • 2.Rd5#
      • 1...Sf7
        • 2.Se6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(c);OGATE::R1(F)
    • Q(c);CHECK,XR(F)::S(G),XQ(c)
    • R(f);CHECK,OGATE,XS(I)::QAB(A),XR(f)
    • B(d);N_PINR(E),P_PINR(F),XP(C)::R1(E)
    • B(d);CHECK,P_PINR(F),XR(E)::S(G),XB(d)
    • S(a);P_SPINB(b),SBLOCK,XB(D)::P(C)
    • S(g);N_PINR(E),P_PINR(F)::R1(E)
    • S(g);OGATE::R1(F)
    • S(g);N_PINS(I)::S(I)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • Q(c);CHECK,XR(F)::S(G),XQ(c)
      • R(f);CHECK,OGATE,XS(I)::QAB(A),XR(f)
      • B(d);CHECK,P_PINR(F),XR(E)::S(G),XB(d)
      • Q(c);OGATE,XQ(A)::R1(F)
      • B(d);N_PINR(E),P_PINR(F),XP(C)::R1(E)
      • S(a);SBLOCK,XB(D)::P(C)
      • Q(c);OGATE::R1(F)
      • B(b);::P(C)
      • S(a);OGATE::R1(F)
      • S(g);N_PINR(E),P_PINR(F)::R1(E)
      • S(g);N_PINS(I)::S(I)
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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).