MESON Chess Problem Database

Problem Display
PID: 260791 (3R1K2/1B2Q3/2R1p1p1/r3p3/3Bk1Pn/6P1/q7/n3Nb1N w - - 0 1)

Johner, Hans

Neue Zurcher Zeitung, 1958

3R1K2/1B2Q3/2R1p1p1/r3p3/3Bk1Pn/6P1/q7/n3Nb1N

#2

10 + 9

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qb1
      • 2.Sf2#
    • 1...Qb3
      • 2.Sf2#
    • 1...Qc4
      • 2.Sf2#
    • 1...Qc2
      • 2.Rc5#
    • 1...Qd2
      • 2.Rc5#
    • 1...Qe2
      • 2.Rc5#
    • 1...Qf2+
      • 2.Sxf2#
    • 1...Qg2
      • 2.Rc5#
    • 1...Qh2
      • 2.Rc5#
    • 1...Qa3
      • 2.Sf2#
      • 2.Rc5#
    • 1...Qa4
      • 2.Sf2#
    • 1...Ra3
      • 2.Rc4#
    • 1...Ra4
      • 2.Rc4#
    • 1...Ra8
      • 2.Rc4#
    • 1...Be2
      • 2.Sf2#
    • 1...Sc2
      • 2.Sf2#
    • 1...Sb3
      • 2.Rc5#
    • 1...exd4
      • 2.Rxe6#
  • Tries
    • 1.Qg5?
      • threat
        • 2.Qe3#
      • 1...Qf2+
        • 2.Sxf2#
      • 1...Qa3+
        • 2.Rc5#
      • 1...exd4
        • 2.Rxe6#
        • 2.Qf4#
      • 1...Qb3
        • 2.Sf2#
      • 1...Qd2
        • 2.Rc5#
      • 1...Qe2
        • 2.Rc5#
      • 1...Ra3
        • 2.Rc4#
        • 2.Qxe5#
      • 1...Sc2
        • 2.Sf2#
      • 1...Sg2
        • 2.Qxg6#
      • 1...Sf5!
  • Keys
    • 1.Qa3!
      • threat
        • 2.Qe3#
      • 1...Qf2+
        • 2.Sxf2#
      • 1...Qxa3+
        • 2.Rc5#
      • 1...Rxa3
        • 2.Rc4#
      • 1...exd4
        • 2.Rxe6#
      • 1...Qb3
        • 2.Sf2#
      • 1...Qd2
        • 2.Rc5#
      • 1...Qe2
        • 2.Rc5#
      • 1...Bd3
        • 2.Qxd3#
      • 1...Sc2
        • 2.Sf2#
      • 1...Sb3
        • 2.Rc5#
      • 1...Sg2
        • 2.Qf3#
      • 1...Sf5
        • 2.Qf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 9
  • Sets
    • Q(c);N_GUARD::S(B)
    • Q(c);N_GUARD::B(G)+R(F)
    • Q(c);CHECK,N_GUARD::S(B),XQ(c)
    • R(f);N_GUARD::B(G)+R(F)
    • R(f);N_GUARD,P_PINR(I)::B(G)+R(F)
    • B(b);S_CUTQ(c)::S(B)
    • S(a);S_CUTQ(c)::S(B)
    • S(a);S_CUTQ(c)::B(G)+R(F)
    • P(g);P_SPINP(h),XB(D)::B(G)+R(F),DCHECK,XP(h)
  • Tries
    • Try
      • Q(H);
      • Threat
        • QAR1(H)
      • Vars
        • Q(c);CHECK,N_GUARD::S(B),XQ(c)
        • Q(c);CHECK,N_GUARD::B(G)+R(F)
        • Q(c);N_GUARD::S(B)
        • Q(c);N_GUARD::B(G)+R(F)
        • S(a);S_CUTQ(c)::S(B)
        • S(e);N_GUARD::QAB(H),XP(i)
      • Refutation
        • S(e);
  • Actual
    • Q(H);
    • Threat
      • QAR1(H)
    • Vars
      • Q(c);CHECK,N_GUARD::S(B),XQ(c)
      • Q(c);CHECK,N_GUARD,XQ(H)::B(G)+R(F)
      • R(f);N_GUARD,XQ(H)::B(G)+R(F)
      • P(g);XB(D)::B(G)+R(F),DCHECK,XP(h)
      • Q(c);N_GUARD::S(B)
      • Q(c);N_GUARD::B(G)+R(F)
      • B(b);N_GUARD::QAB1(H),XB(b)
      • S(a);S_CUTQ(c)::S(B)
      • S(a);S_CUTQ(c)::B(G)+R(F)
      • S(e);N_GUARD::QAB1(H)
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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).