MESON Chess Problem Database

Problem Display
PID: 263867 (8/2K2R2/6p1/2QpknR1/4p3/7B/3P4/8 w - - 0 1)

van der Gaag, J

3rd Prize, Tijdschrift vd NSB, 1927

8/2K2R2/6p1/2QpknR1/4p3/7B/3P4/8

#2

6 + 5

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Ke6
      • 2.Qe7#
    • 1...e3
      • 2.Qxe3#
  • Tries
    • 1.Kc6?
      • 1...Ke6
        • 2.Qe7#
        • 2.Qxd5#
      • 1...e3
        • 2.Qxe3#
      • 1...Kf4!
    • 1.Kd7?
      • 1...e3
        • 2.Qxe3#
      • 1...Kf4!
    • 1.Bg4?
      • 1...Ke6
        • 2.Qe7#
      • 1...e3
        • 2.Qxe3#
      • 1...Kf4!
    • 1.Rgxf5+?
      • 1...Ke6
        • 2.R7f6#
        • 2.Re7#
        • 2.Qb6#
        • 2.Qd6#
        • 2.Qe7#
        • 2.Qxd5#
        • 2.Qc6#
      • 1...gxf5!
    • 1.Rfxf5+?
      • 1...Ke6
        • 2.Rf1#
        • 2.Rf2#
        • 2.Rf3#
        • 2.Rf4#
        • 2.Rf8#
        • 2.Rxg6#
        • 2.Qd6#
      • 1...gxf5!
    • 1.Rf8?
      • 1...Ke6
        • 2.Qd6#
      • 1...e3
        • 2.Qxe3#
      • 1...Kf4!
    • 1.Qb6?
      • 1...e3
        • 2.Qxe3#
      • 1...d4
        • 2.Qd6#
      • 1...Kf4!
    • 1.Qc3+?
      • 1...Kf4
        • 2.Rg4#
        • 2.Qg3#
      • 1...Ke6
        • 2.Qf6#
      • 1...d4!
    • 1.d3?
      • 1...Ke6
        • 2.Qe7#
      • 1...exd3
        • 2.Qe3#
      • 1...e3
        • 2.Qxe3#
      • 1...Kf4!
    • 1.d4+?
      • 1...Ke6
        • 2.Qe7#
      • 1...exd4 ep
        • 2.Qe3#
      • 1...Kf4!
  • Keys
    • 1.Qa3!
      • 1...Kd4
        • 2.Qc3#
      • 1...Kf4
        • 2.Qg3#
      • 1...Ke6
        • 2.Qe7#
      • 1...e3
        • 2.Qxe3#
      • 1...d4
        • 2.Qd6#

This is a version of 231228

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(c);N_GUARD,N_SPINP(b),P-FLIGHT::QAR1(C)
    • P(a);OGATEB::QAR2(C),XP(a)
  • Tries
    • Try
      • K(E);P-FLIGHT
      • Vars
        • P(a);OGATEB::QAR2(C),XP(a)
      • Refutation
        • K(c);N_SPINP(b),S_FLIGHT
    • Try
      • K(E);P-FLIGHT
      • Vars
        • P(a);OGATEB::QAR2(C),XP(a)
      • Refutation
        • K(c);N_SPINP(b),S_FLIGHT
    • Try
      • B(B);
      • Vars
        • K(c);N_GUARD,N_SPINP(b),P-FLIGHT::QAR1(C)
        • P(a);OGATEB::QAR2(C),XP(a)
      • Refutation
        • K(c);N_SPINP(b),S_FLIGHT
    • Try
      • R(D);CHECK,XS(d)
      • Refutation
        • P(e);XR(D)
    • Try
      • R(F);CHECK,XS(d)
      • Refutation
        • P(e);XR(F)
    • Try
      • R(F);
      • Vars
        • K(c);N_GUARD,N_SPINP(b),P-FLIGHT::QAR1(C)
        • P(a);OGATEB::QAR2(C),XP(a)
      • Refutation
        • K(c);N_SPINP(b),S_FLIGHT
    • Try
      • Q(C);N_PINP(b)
      • Vars
        • P(a);OGATEB::QAR2(C),XP(a)
        • P(b);::QAB1(C)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(C);CHECK,N_PINP(b)
      • Vars
        • K(c);OGATE,P-FLIGHT::QAR1(C)
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • P(A);
      • Vars
        • K(c);N_GUARD,N_SPINP(b),P-FLIGHT::QAR1(C)
        • P(a);OGATEB,XP(A)::QAR2(C)
        • P(a);OGATEB::QAR2(C),XP(a)
      • Refutation
        • K(c);N_SPINP(b),S_FLIGHT
    • Try
      • P(A);CHECK
      • Vars
        • K(c);N_GUARD,N_SPINP(b),P-FLIGHT::QAR1(C)
        • P(a);EP,OGATE,XP(A)::QAR2(C)
      • Refutation
        • K(c);N_SPINP(b),S_FLIGHT
  • Actual
    • Q(C);N_PINP(b)
    • Vars
      • K(c);N_GUARD,N_SPINS(d),S_CUTP(b),S_FLIGHT::QAB1(C)
      • K(c);N_GUARD,S_FLIGHT::QAB1(C)
      • K(c);N_GUARD,P-FLIGHT::QAR1(C)
      • P(a);OGATEB::QAR2(C),XP(a)
      • P(b);::QAB1(C)
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).