MESON Chess Problem Database

Problem Display
PID: 44056 (6B1/pr6/Q3N3/1P5r/1Nk1P2p/1R2P3/7K/1n1bB3 w - - 0 1)

Nietvelt, Gustaaf Josephus

1st Comm., Els Escacs a Catalunya, 1930

6B1/pr6/Q3N3/1P5r/1Nk1P2p/1R2P3/7K/1n1bB3

#2

10 + 7

20 De Problemist 1931

SOLUTION

  • SOUND
  • Sets
    • 1...Kxb3
      • 2.Qa2#
  • Tries
    • 1.Sd5?
      • threat
        • 2.Qa4#
      • 1...Rxb5
        • 2.Qxb5#
      • 1...Bxb3
        • 2.b6#
      • 1...Sc3
        • 2.Rxc3#
      • 1...Kxb3!
    • 1.Sd4+?
      • 1...Kc5
        • 2.Sd3#
        • 2.Qc6#
      • 1...Rd5
        • 2.Qc6#
      • 1...Rf7!
    • 1.Sg5+?
      • 1...Kc5
        • 2.Sd3#
        • 2.Qc6#
      • 1...Rf7!
    • 1.Sc7+?
      • 1...Kc5
        • 2.Sd3#
        • 2.Qc6#
      • 1...Rd5!
    • 1.Qc6+?
      • 1...Rc5
        • 2.Sc7#
      • 1...Kxb3!
    • 1.b6+?
      • 1...Kxb3
        • 2.Qa2#
      • 1...Rb5!
  • Keys
    • 1.Sd3!
      • threat
        • 2.Qa4#
      • 1...Kxb3
        • 2.Sd4#
      • 1...Rhxb5
        • 2.Sc7#
      • 1...Rbxb5
        • 2.Sg5#
      • 1...Bxb3
        • 2.Sb2#
      • 1...Sc3
        • 2.Rxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(c);OGATEB,S_FLIGHT,XR(C)::QAB1(H)
  • Tries
    • Try
      • S(E);
      • Threat
        • QAR2(H)
      • Vars
        • R(g);OGATE,P_SPINR(g),XP(G)::QAB1(H),XR(g)
        • B(b);SBLOCK,XR(C)::QAB(H)+P(G)
        • S(a);N_GUARD::R1(C),XS(a)
      • Refutation
        • K(c);S_FLIGHT,XR(C)
    • Try
      • S(I);CHECK
      • Vars
        • R(e);P_SPINR(e)::QAR2(H)
      • Refutation
        • R(g);P_SPINR(g)
    • Try
      • S(I);CHECK
      • Refutation
        • R(g);P_SPINR(g)
    • Try
      • S(I);CHECK
      • Refutation
        • R(e);P_SPINR(e)
    • Try
      • Q(H);CHECK
      • Vars
        • R(e);P_SPINR(e)::B(J)+S(I)
      • Refutation
        • K(c);S_FLIGHT,XR(C)
    • Try
      • P(G);CHECK
      • Vars
        • K(c);OGATEB,S_FLIGHT,XR(C)::QAB1(H)
      • Refutation
        • R(e);P_SPINR(e)
  • Actual
    • S(E);
    • Threat
      • QAR2(H)
    • Vars
      • K(c);S_FLIGHT,XR(C)::B(J)+S(I),DCHECK
      • R(e);N_GUARD,P_SPINR(e),XP(G)::B(J)+S(I)
      • R(g);N_GUARD,P_SPINR(g),XP(G)::B(J)+S(I)
      • B(b);SBLOCK,XR(C)::S(E)
      • S(a);N_GUARD::R1(C),XS(a)
HTML5 logo

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).