MESON Chess Problem Database

Problem Display
PID: 178339 (2NRK3/2N1Q3/1pp3p1/p7/2k1b1B1/B1p5/2P2bp1/3nr3 w - - 0 1)

Prytz, Rudolf

3rd Prize, Ostdeutsche Morgenpost, 1923

2NRK3/2N1Q3/1pp3p1/p7/2k1b1B1/B1p5/2P2bp1/3nr3

#2

8 + 11

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Re3
      • 2.Sxb6#
    • 1...Bg3
      • 2.Sxb6#
    • 1...Bd4
      • 2.Sd6#
    • 1...Bh4
      • 2.Sxb6#
    • 1...Se3
      • 2.Sxb6#
      • 2.Qxe4#
    • 1...a4
      • 2.Qb4#
    • 1...c5
      • 2.Sxb6#
  • Tries
    • 1.Be2+?
      • 1...Bd3
        • 2.Bxd3#
        • 2.Qe6#
        • 2.Qf7#
      • 1...Rxe2!
    • 1.Rd4+?
      • 1...Bxd4
        • 2.Sd6#
      • 1...Kxd4!
    • 1.Qc5+?
      • 1...bxc5
        • 2.Sb6#
      • 1...Bxc5!
    • 1.Qxe4+?
      • 1...Bd4
        • 2.Sxb6#
        • 2.Sd6#
        • 2.Be6#
        • 2.Rxd4#
      • 1...Rxe4+!
    • 1.Qe5?
      • threat
        • 2.Sd6#
      • 1...Bxc2
        • 2.Be6#
      • 1...Bc5!
  • Keys
    • 1.Qh4!
      • threat
        • 2.Be6#
      • 1...Bd5+
        • 2.Be2#
      • 1...Bf5+
        • 2.Be2#
      • 1...Bxh4
        • 2.Sxb6#
      • 1...Bd4
        • 2.Sd6#
      • 1...Se3
        • 2.Sxb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • R(b);S_CUTB(c)::S(F),XP(i)
    • B(c);N_GUARD::S(F),XP(i)
    • B(c);SBLOCK::S(F)
    • P(h);N_GUARD::QAR1(E)
    • P(j);S_CUTB(c)::S(F),XP(i)
  • Tries
    • Try
      • B(C);CHECK
      • Refutation
        • R(b);XB(C)
    • Try
      • R(G);CHECK
      • Vars
        • B(c);SBLOCK,XR(G)::S(F)
      • Refutation
        • K(f);P-FLIGHT,XR(G)
    • Try
      • Q(E);CHECK
      • Vars
        • P(i);XQ(E)::S(F)
      • Refutation
        • B(c);XQ(E)
    • Try
      • Q(E);CHECK,P_SPINQ(E),XB(g)
      • Refutation
        • R(b);CHECK,XQ(E)
    • Try
      • Q(E);
      • Threat
        • S(F)
      • Vars
        • B(g);N_GUARD,P_PINQ(E),XP(A)::B(C)
      • Refutation
        • B(c);
  • Actual
    • Q(E);
    • Threat
      • B(C)
    • Vars
      • B(g);CHECK::QAR(E)+B(C),DCHECK
      • B(c);N_GUARD,XQ(E)::S(F),XP(i)
      • B(c);SBLOCK::S(F)
      • S(a);S_CUTB(c)::S(F),XP(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).