MESON Chess Problem Database

Problem Display
PID: 268481 (2q2B2/3Qnr2/3n4/P1krN2R/pN2P3/bPPB1p1K/8/8 w - - 0 1)

Katko, J

Die Schwalbe, 1931

2q2B2/3Qnr2/3n4/P1krN2R/pN2P3/bPPB1p1K/8/8

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qa6
      • 2.Sxa6#
    • 1...Qxd7+
      • 2.Sxd7#
    • 1...Qc7
      • 2.Sa6#
    • 1...Qb8
      • 2.Sa6#
    • 1...Qd8
      • 2.Sa6#
    • 1...Qe8
      • 2.Sa6#
      • 2.Qa7#
    • 1...Qxf8
      • 2.Sa6#
      • 2.Qa7#
    • 1...Rxd3
      • 2.Sbxd3#
      • 2.Sexd3#
    • 1...Rf5
      • 2.Qa7#
    • 1...Sdf5
      • 2.Qxd5#
    • 1...Sb7
      • 2.Sa6#
    • 1...Sef5
      • 2.Qb5#
  • Tries
    • 1.Bc4?
      • threat
        • 2.Sed3#
      • 1...Qxd7+
        • 2.Sxd7#
      • 1...Rxe5
        • 2.Sd3#
      • 1...Rd3
        • 2.Sbxd3#
        • 2.Sexd3#
      • 1...Rf5
        • 2.Qa7#
      • 1...Sdf5
        • 2.Qxd5#
      • 1...Sef5
        • 2.Qb5#
      • 1...axb3!
    • 1.Qxc8+?
      • 1...Sc6
        • 2.Sa6#
        • 2.Qxc6#
      • 1...Sexc8
        • 2.Sa6#
      • 1...Sdxc8!
  • Keys
    • 1.Ba6!
      • threat
        • 2.Sed3#
      • 1...Qxd7+
        • 2.Sxd7#
      • 1...Qxa6
        • 2.Sxa6#
      • 1...Rxe5
        • 2.Sd3#
      • 1...Rd3
        • 2.Sbxd3#
        • 2.Sexd3#
      • 1...Rf5
        • 2.Qa7#
      • 1...Sdf5
        • 2.Qxd5#
      • 1...Sef5
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • Q(i);N_GUARD,N_PINQ(J)::S(E),XQ(i)
    • Q(i);CHECK,XQ(J)::S(H),XQ(i)
    • Q(i);N_GUARD,N_PINQ(J)::S(E)
    • R(h);N_PINQ(J)::QAB(J)
    • S(f);N_PINQ(J),P_SPINS(g)::QAR1(J),XR(e)
    • S(f);P_SPINS(g),S_CUTQ(i)::S(E)
    • S(g);N_PINQ(J),P_SPINS(f)::QAR1(J)
  • Tries
    • Try
      • B(C);
      • Threat
        • S(H)
      • Vars
        • Q(i);CHECK,XQ(J)::S(H),XQ(i)
        • R(e);N_GUARD,P_SPINR(e),XS(H)::S(E)
        • R(h);N_PINQ(J)::QAB(J)
        • S(f);N_PINQ(J),P_SPINS(g)::QAR1(J),XR(e)
        • S(g);N_PINQ(J),P_SPINS(f)::QAR1(J)
      • Refutation
        • P(c);XP(A)
    • Try
      • Q(J);CHECK,N_SPINQ(J),XQ(i)
      • Vars
        • S(g);P_SPINS(f),XQ(J)::S(E)
      • Refutation
        • S(f);P_SPINS(g),XQ(J)
  • Actual
    • B(C);
    • Threat
      • S(H)
    • Vars
      • Q(i);CHECK,XQ(J)::S(H),XQ(i)
      • Q(i);N_PINQ(J),XB(C)::S(E),XQ(i)
      • R(e);N_GUARD,P_SPINR(e),XS(H)::S(E)
      • R(h);N_PINQ(J)::QAB(J)
      • S(f);N_PINQ(J),P_SPINS(g)::QAR1(J),XR(e)
      • S(g);N_PINQ(J),P_SPINS(f)::QAR1(J)
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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).