MESON Chess Problem Database

Problem Display
PID: 197170 (n7/1Qp1p3/p1r2p2/R1Pk1B2/R2pN3/Bp1N4/1K1P4/n7 w - - 0 1)

Feenstra Kuiper, Pieter

Haagsche Post, 1921

n7/1Qp1p3/p1r2p2/R1Pk1B2/R2pN3/Bp1N4/1K1P4/n7

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Sc2
      • 2.Qxb3#
    • 1...Sb6
      • 2.cxb6#
    • 1...e5
      • 2.Sxf6#
    • 1...e6
      • 2.Sxf6#
  • Tries
    • 1.Kxa1?
      • threat
        • 2.Qxb3#
      • 1...Sb6
        • 2.cxb6#
      • 1...b2+!
    • 1.Kb1?
      • 1...Sc2
        • 2.Qxb3#
      • 1...Sb6
        • 2.cxb6#
      • 1...e5
        • 2.Sxf6#
      • 1...e6
        • 2.Sxf6#
      • 1...b2!
    • 1.Sb4+?
      • 1...Kc4
        • 2.d3#
      • 1...Ke5!
    • 1.Sef2?
      • 1...Sc2
        • 2.Qxb3#
      • 1...Sb6
        • 2.cxb6#
      • 1...e6
        • 2.Be4#
      • 1...e5!
    • 1.Sg3?
      • 1...Sc2
        • 2.Qxb3#
      • 1...Sb6
        • 2.cxb6#
      • 1...e6
        • 2.Be4#
      • 1...e5!
    • 1.Sg5?
      • threat
        • 2.Be4#
        • 2.Be6#
      • 1...e6
        • 2.Be4#
        • 2.Bxe6#
      • 1...fxg5!
    • 1.Rb4?
      • 1...Sb6
        • 2.cxb6#
      • 1...e5
        • 2.Sxf6#
      • 1...e6
        • 2.Sxf6#
      • 1...Sc2!
    • 1.Qxa8?
      • 1...e5
        • 2.Sxf6#
      • 1...e6
        • 2.Sxf6#
      • 1...Sc2!
  • Keys
    • 1.Sd6!
      • 1...cxd6
        • 2.cxd6#
      • 1...exd6
        • 2.cxd6#
      • 1...Sc2
        • 2.Qxb3#
      • 1...Sb6
        • 2.cxb6#
      • 1...e5
        • 2.Sb4#
      • 1...e6
        • 2.Be4#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAB(J),XP(b)
    • S(j);OGATE::R(G)+P(H),XS(j)
    • P(i);N_GUARD::S(F),XP(g)
  • Tries
    • Try
      • K(A);S_FLIGHT,XS(a)
      • Threat
        • QAB(J),XP(b)
      • Vars
        • S(j);OGATE::R(G)+P(H),XS(j)
      • Refutation
        • P(b);CHECK
    • Try
      • K(A);P-FLIGHT
      • Vars
        • S(a);N_GUARD::QAB(J),XP(b)
        • S(j);OGATE::R(G)+P(H),XS(j)
        • P(i);N_GUARD::S(F),XP(g)
      • Refutation
        • P(b);
    • Try
      • S(D);CHECK
      • Vars
        • K(d);N_SPINR(f),S_FLIGHT::P(B)
      • Refutation
        • K(d);N_SPINR(f),P-FLIGHT
    • Try
      • S(F);
      • Vars
        • S(a);N_GUARD::QAB(J),XP(b)
        • S(j);OGATE::R(G)+P(H),XS(j)
        • P(i);SBLOCK::B(I)
      • Refutation
        • P(i);
    • Try
      • S(F);
      • Vars
        • S(a);N_GUARD::QAB(J),XP(b)
        • S(j);OGATE::R(G)+P(H),XS(j)
        • P(i);SBLOCK::B(I)
      • Refutation
        • P(i);
    • Try
      • S(F);
      • Threat
        • DUALS(2)
      • Refutation
        • P(g);XS(F)
    • Try
      • R(E);
      • Vars
        • S(j);OGATE::R(G)+P(H),XS(j)
        • P(i);N_GUARD::S(F),XP(g)
      • Refutation
        • S(a);
    • Try
      • Q(J);XS(j)
      • Vars
        • P(i);N_GUARD::S(F),XP(g)
      • Refutation
        • S(a);
  • Actual
    • S(F);
    • Vars
      • P(h);OGATE,XS(F)::R(G)+P(H),XP(h)
      • P(i);OGATE,XS(F)::R(G)+P(H),XP(i)
      • S(a);N_GUARD::QAB(J),XP(b)
      • S(j);OGATE::R(G)+P(H),XS(j)
      • P(i);SBLOCK::S(D)
      • P(i);SBLOCK::B(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).