MESON Chess Problem Database

Problem Display
PID: 220403 (1B6/pPNbp3/1r4Q1/1p1p1p2/1P1k4/1K1pnP2/3P4/8 w - - 0 1)

Pedersen, Jens Otto

Die Schwalbe, 1928

1B6/pPNbp3/1r4Q1/1p1p1p2/1P1k4/1K1pnP2/3P4/8

#2

8 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rc6
      • 2.Sxb5#
    • 1...Bc6
      • 2.Se6#
    • 1...Be6
      • 2.Qg7#
  • Tries
    • 1.Se6+?
      • 1...Bxe6
        • 2.Qg7#
      • 1...Rxe6!
    • 1.Qg1?
      • threat
        • 2.Qxe3#
        • 2.Qa1#
      • 1...Ra6
        • 2.Qxe3#
      • 1...Rc6
        • 2.Sxb5#
        • 2.Qxe3#
      • 1...Re6
        • 2.Qa1#
      • 1...f4
        • 2.Qa1#
      • 1...Ke5!
    • 1.Qxb6+?
      • 1...Ke5
        • 2.Sxb5#
        • 2.Sa6#
        • 2.Sa8#
        • 2.Se8#
      • 1...axb6!
  • Keys
    • 1.Qc6!
      • threat
        • 2.Qc3#
      • 1...Ke5
        • 2.Sxb5#
      • 1...Rxc6
        • 2.Sxb5#
      • 1...Bxc6
        • 2.Se6#
      • 1...Sd1
        • 2.Qxd5#
      • 1...Sc4
        • 2.Qxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(g);N_GUARD,S_CUTB(i)::S(G),XP(d)
    • B(i);N_GUARD,S_CUTR(g)::S(G)
    • B(i);S_CUTP(j),S_CUTR(g)::QAB(E)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • B(i);XS(G)::QAB(E)
      • Refutation
        • R(g);XS(G)
    • Try
      • Q(E);P_PINS(b)
      • Threat
        • DUALS(2)
      • Vars
        • R(g);::QAB1(E),XS(b)
        • R(g);::QAB(E)
        • P(f);::QAB(E)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT
    • Try
      • Q(E);CHECK,XR(g)
      • Refutation
        • P(h);XQ(E)
  • Actual
    • Q(E);
    • Threat
      • QAB1(E)
    • Vars
      • K(c);S_FLIGHT::B(H)+S(G),XP(d)
      • R(g);N_GUARD,XQ(E)::S(G),XP(d)
      • B(i);N_GUARD,XQ(E)::S(G)
      • S(b);N_GUARD::QAR1(E),XP(e)
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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).