MESON Chess Problem Database

Problem Display
PID: 194015 (8/Q1N2p1K/1nrp4/2kp3R/3Rp3/2b1n3/2N2B2/1r6 w - - 0 1)

Koetsheid, Petrus Albertus

1st Prize, Tijdschrift vd NSB, 1917

8/Q1N2p1K/1nrp4/2kp3R/3Rp3/2b1n3/2N2B2/1r6

#2

7 + 10

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rb5
      • 2.Sa6#
    • 1...Bb2
      • 2.Qa5#
    • 1...Sd1
      • 2.Rhxd5#
    • 1...Sf1
      • 2.Rhxd5#
    • 1...Sxc2
      • 2.Rhxd5#
    • 1...Sg2
      • 2.Rhxd5#
    • 1...Sc4
      • 2.Rdxd5#
      • 2.Rhxd5#
    • 1...Sg4
      • 2.Rhxd5#
  • Tries
    • 1.Se6+?
      • 1...Kb5
        • 2.Sa3#
      • 1...fxe6!
    • 1.Qa5+?
      • 1...Rb5
        • 2.Sa6#
        • 2.Qxb5#
      • 1...Bxa5!
  • Keys
    • 1.Sa3!
      • threat
        • 2.Rc4#
      • 1...Kxd4
        • 2.Rxd5#
      • 1...Bxd4
        • 2.Sa6#
      • 1...Rb4
        • 2.Rdxd5#
      • 1...Sc4
        • 2.Sa6#
        • 2.Rxc4#
      • 1...f5
        • 2.Se6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • R(a);SBLOCK::S(F)
    • B(b);N_GUARD,S_CUTR(a)::QAR2(E)
    • S(c);N_GUARD::R1(D),XP(f)
    • S(c);N_GUARD,XS(A)::R1(D),XP(f)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(e);N_SPINS(g),P-FLIGHT::S(A)
      • Refutation
        • P(j);XS(F)
    • Try
      • Q(E);CHECK,N_PINS(g)
      • Refutation
        • B(b);XQ(E)
  • Actual
    • S(A);
    • Threat
      • R1(C)
    • Vars
      • K(e);N_SPINP(f),N_SPINS(g),P_SPINS(c),S_FLIGHT,XR(C)::R1(D),XP(f)
      • B(b);SBLOCK,XR(C)::S(F)
      • R(a);SBLOCK::R1(C),XP(f)
      • P(j);N_GUARD,N_SPINP(f)::S(F)
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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).