MESON Chess Problem Database

Problem Display
PID: 6581 (3RK1N1/2B1Pn1b/3pk3/1N3r2/2RQp1P1/2p3b1/B6r/3n2q1 w - - 0 1)

Kubbel, Leonid Ivanovich (AKA Kubbel, Karl Artur Leonid)

1st Prize, BCF 010. Ty., 1932-1933

3RK1N1/2B1Pn1b/3pk3/1N3r2/2RQp1P1/2p3b1/B6r/3n2q1

#2

10 + 11

5862 An ABC of Chess Problems 1970
3098 FIDE Album (1914-1944) (I) 1971
133 The Problemist Supplement 2009
14868 Pirnie Collection 2014
3713 Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rd5
      • 2.Qf6#
    • 1...Se5
      • 2.Rxd6#
      • 2.Qxd6#
    • 1...Sxd8
      • 2.exd8S#
  • Tries
    • 1.Rc6+?
      • 1...Rd5
        • 2.Bxd5#
        • 2.Qf6#
        • 2.Qxd5#
      • 1...Rxa2!
    • 1.Qf6+?
      • 1...Rxf6
        • 2.Rxe4#
      • 1...Kd5!
    • 1.Qxd6+?
      • 1...Bxd6
        • 2.Rxe4#
      • 1...Sxd6+!
  • Keys
    • 1.Qf2!
      • threat
        • 2.Rxe4#
      • 1...Kd5
        • 2.Rc5#
      • 1...Ke5
        • 2.Rc5#
      • 1...Bxg8
        • 2.Qxf5#
      • 1...d5
        • 2.Sd4#
      • 1...Rd5
        • 2.Qf6#
      • 1...Re5
        • 2.Qxf7#
      • 1...Be5
        • 2.Rc6#
      • 1...Se5
        • 2.Rxd6#
      • 1...e3
        • 2.Re4#

This anticipates 264240(1950)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • R(g);N_GUARD,SBLOCK::QAR1(C)
    • S(j);OGATE,XR(H)::PXS(j)=S
  • Tries
    • Try
      • R(B);CHECK,P_PINP(h)
      • Refutation
        • R(c);XB(A)
    • Try
      • Q(C);CHECK
      • Vars
        • R(g);XQ(C)::B(A)+R(B),DCHECK,XP(f)
      • Refutation
        • K(i);P_SPINP(h),S_FLIGHT
    • Try
      • Q(C);CHECK,XP(h)
      • Vars
        • B(e);XQ(C)::B(A)+R(B),DCHECK,XP(f)
      • Refutation
        • S(j);CHECK,XQ(C)
  • Actual
    • Q(C);
    • Threat
      • B(A)+R(B),DCHECK,XP(f)
    • Vars
      • K(i);P_SPINP(h),S_FLIGHT::B(A)+R(B),DCHECK
      • K(i);P-FLIGHT,P_SPINP(h)::R(B)
      • B(k);N_GUARD,XS(J)::QAB1(C),XR(g)
      • P(h);::S(E)
      • R(g);OGATE,SBLOCK::QAR1(C)
      • R(g);OGATE,SBLOCK::QAB1(C),XS(j)
      • B(e);SBLOCK,S_CUTR(g)::B(A)+R(B)
      • S(j);N_GUARD,SBLOCK,S_CUTB(e)::R1(H),XP(h)
      • P(f);::B(A)+R(B),DCHECK
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).