MESON Chess Problem Database

Problem Display
PID: 90118 (8/7p/B7/B4R1K/8/2q1Q1pN/p2nN2b/1R1bk1n1 w - - 0 1)

Strerath, Otto

Die Schwalbe, 1949

8/7p/B7/B4R1K/8/2q1Q1pN/p2nN2b/1R1bk1n1

#2

8 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Bxd2#
      • 2.Qxd2#
    • 1...Qe5
      • 2.Bxd2#
      • 2.Qxd2#
    • 1...Qf6
      • 2.Bxd2#
      • 2.Qxd2#
    • 1...Qg7
      • 2.Bxd2#
      • 2.Qxd2#
    • 1...Qh8
      • 2.Bxd2#
      • 2.Qxd2#
    • 1...Qa3
      • 2.Bxd2#
      • 2.Qxd2#
    • 1...Qb3
      • 2.Bxd2#
      • 2.Qxd2#
    • 1...Qc4
      • 2.Bxd2#
      • 2.Qxd2#
    • 1...Qc5
      • 2.Bxd2#
      • 2.Qxd2#
    • 1...Qc6
      • 2.Bxd2#
      • 2.Qxd2#
    • 1...Qc7
      • 2.Bxd2#
      • 2.Qxd2#
    • 1...Qc8
      • 2.Bxd2#
      • 2.Qxd2#
    • 1...Sxe2
      • 2.Qxe2#
    • 1...Sgf3
      • 2.Sxc3#
    • 1...Sdf3
      • 2.Sexg1#
    • 1...g2
      • 2.Qf2#
  • Tries
    • 1.Bxc3?
      • threat
        • 2.Bxd2#
        • 2.Qxd2#
      • 1...Sf3
        • 2.Seg1#
        • 2.Sxg3#
        • 2.Sd4#
        • 2.Sef4#
      • 1...axb1S!
    • 1.Qxg1+?
      • 1...Sf1
        • 2.Bxc3#
      • 1...Bxg1!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Sg2#
      • 1...Kf1
        • 2.Rxd1#
      • 1...Qc6
        • 2.Sd3#
      • 1...Sgf3
        • 2.Sxc3#
      • 1...Sdf3
        • 2.Sxg1#
      • 1...g2
        • 2.Sxg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(c);OGATE,P_SPINS(c),XS(B)::QAR1(C),XS(c)
    • S(c);N_PINS(B)::QAR(C)+S(B),XQ(g)
    • S(e);N_PINS(B),P_SPINQ(g)::QAR(C)+S(B),XS(c)
    • P(h);N_GUARD::QAB1(C)
  • Tries
    • Try
      • B(E);P_PINS(e),XQ(g)
      • Threat
        • DUALS(2)
      • Refutation
        • P(d);N_SPINB(a),XR(A)
    • Try
      • Q(C);CHECK,XS(c)
      • Vars
        • S(e);P_SPINQ(g),P_SPINS(e),S_CUTB(f)::B(E),XQ(g)
      • Refutation
        • B(f);XQ(C)
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • K(b);P-FLIGHT::R(A),XB(a)
      • Q(g);N_GUARD,P_SPINS(e)::S(D)
      • S(c);N_PINS(B)::QAR(C)+S(B),XQ(g)
      • S(e);N_PINS(B),P_SPINQ(g)::QAR(C)+S(B),XS(c)
      • P(h);::S(D),XP(h)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).