MESON Chess Problem Database

Problem Display
PID: 263975 (8/2Q1p1K1/B2p1p2/Rp2k1p1/3N2p1/p5P1/pr2NPP1/B3R3 w - - 0 1)

van der Veken, R

Tijdschrift vd KNSB, 1959

8/2Q1p1K1/B2p1p2/Rp2k1p1/3N2p1/p5P1/pr2NPP1/B3R3

#2

11 + 10

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rb4
      • 2.Sf4#
  • Tries
    • 1.Sf4+?
      • 1...Re2
        • 2.Rxe2#
        • 2.Qxe7#
      • 1...Kxd4!
    • 1.Rxb5+?
      • 1...Rxb5
        • 2.Sf4#
      • 1...Ke4!
    • 1.Qc4?
      • threat
        • 2.Qe6#
      • 1...Ke4
        • 2.Sc3#
      • 1...e6
        • 2.Qxe6#
      • 1...d5!
    • 1.Qc5+?
      • 1...Ke4
        • 2.Qf5#
      • 1...d5
        • 2.Qxe7#
      • 1...dxc5!
    • 1.Qd7?
      • threat
        • 2.Qf5#
        • 2.Qe6#
      • 1...Ke4
        • 2.Qf5#
      • 1...d5
        • 2.Qe6#
        • 2.Qxe7#
      • 1...f5
        • 2.Qxf5#
        • 2.Qe6#
      • 1...e6
        • 2.Qxe6#
      • 1...Kd5!
    • 1.Qc8?
      • threat
        • 2.Qf5#
        • 2.Qe6#
      • 1...Ke4
        • 2.Qf5#
      • 1...d5
        • 2.Qe6#
      • 1...f5
        • 2.Qxf5#
        • 2.Qe6#
      • 1...e6
        • 2.Qxe6#
      • 1...Kd5!
  • Keys
    • 1.Sxb5!
      • 1...Ke4
        • 2.Sbc3#
      • 1...Kd5
        • 2.Sec3#
      • 1...Kf5
        • 2.Sed4#
      • 1...Ke6
        • 2.Sbd4#
      • 1...f5
        • 2.Sf4#
      • 1...e6
        • 2.Sxd6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • R(b);N_GUARD::R(B)+S(C)
  • Tries
    • Try
      • S(C);CHECK
      • Refutation
        • K(f);N_SPINP(e),P_SPINR(b),S_FLIGHT,XS(G)
    • Try
      • R(H);CHECK,P_PINP(h),XP(e)
      • Vars
        • R(b);XR(H)::R(B)+S(C)
      • Refutation
        • K(f);N_SPINP(h),P-FLIGHT
    • Try
      • Q(J);
      • Threat
        • QAR1(J)
      • Vars
        • K(f);N_SPINP(e),P-FLIGHT::R(B)+S(C),DCHECK
        • P(j);::QAR1(J),XP(j)
      • Refutation
        • P(h);N_SPINP(e)
    • Try
      • Q(J);CHECK,N_PINP(e)
      • Vars
        • K(f);OGATE,P-FLIGHT::QAB1(J)
        • P(h);OGATE,P_SPINP(h),SBLOCK::QAR2(J),XP(j)
      • Refutation
        • P(h);XQ(J)
    • Try
      • Q(J);
      • Threat
        • DUALS(2)
      • Vars
        • K(f);N_SPINP(e),P-FLIGHT::QAB1(J)
        • P(j);::QAR1(J),XP(j)
      • Refutation
        • K(f);P-FLIGHT
    • Try
      • Q(J);
      • Threat
        • DUALS(2)
      • Vars
        • K(f);N_SPINP(e),P-FLIGHT::QAB1(J)
        • P(h);N_SPINP(e)::QAR1(J)
        • P(j);::QAR1(J),XP(j)
      • Refutation
        • K(f);P-FLIGHT
  • Actual
    • S(G);P_PINP(h),P_PINR(b),XP(e)
    • Vars
      • K(f);N_GUARD,N_SPINP(h),N_SPINR(b),P-FLIGHT,S_CUTR(b)::S(G)
      • K(f);N_GUARD,N_SPINP(h),N_SPINR(b),P-FLIGHT,S_CUTR(b)::S(C)
      • P(i);SBLOCK::R(B)+S(C)
      • P(j);SBLOCK::R(H)+S(G),XP(h)
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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).