MESON Chess Problem Database

Problem Display
PID: 33021 (1B6/K7/Q3pNR1/2pp1k1P/5r1p/5r2/2P1N3/1Bb2R2 w - - 0 1)

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

1st Prize, Zadachi i Etyudi, 1928

1B6/K7/Q3pNR1/2pp1k1P/5r1p/5r2/2P1N3/1Bb2R2

#2

10 + 8

20 De Problemist 1929
881 The Australasian Chess Review 1929
133 The Problemist Supplement 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ra3
      • 2.c3#
    • 1...Rb3
      • 2.cxb3#
    • 1...Rd3
      • 2.Qxd3#
    • 1...Re3
      • 2.Rxf4#
    • 1...Ra4
      • 2.c4#
    • 1...e5
      • 2.Qc8#
  • Tries
    • 1.Sxd5?
      • threat
        • 2.Qxe6#
      • 1...Ke4
        • 2.Qxe6#
      • 1...exd5
        • 2.Qe6#
      • 1...Ra3
        • 2.c3#
      • 1...Re3
        • 2.Rxf4#
      • 1...Ra4
        • 2.c4#
      • 1...Re4
        • 2.Se7#
      • 1...e5!
    • 1.Sg8?
      • threat
        • 2.Qxe6#
      • 1...Ke4
        • 2.Qxe6#
      • 1...Ra3
        • 2.c3#
      • 1...Re3
        • 2.Rxf4#
      • 1...Ra4
        • 2.c4#
      • 1...Re4
        • 2.Se7#
      • 1...e5!
    • 1.Rxf3?
      • threat
        • 2.Qd3#
        • 2.c3#
        • 2.c4#
      • 1...c4
        • 2.Sd4#
        • 2.c3#
      • 1...d4
        • 2.Qd3#
      • 1...e5
        • 2.Qc8#
      • 1...Rxf3!
    • 1.c3+?
      • 1...Rd3
        • 2.Bxd3#
        • 2.Qxd3#
      • 1...Re4!
    • 1.c4+?
      • 1...Rd3
        • 2.Bxd3#
      • 1...Re4!
  • Keys
    • 1.Se8!
      • threat
        • 2.Qxe6#
      • 1...Ke4
        • 2.Qxe6#
      • 1...e5
        • 2.Sd6#
      • 1...Ra3
        • 2.c3#
      • 1...Re3
        • 2.Rxf4#
      • 1...Ra4
        • 2.c4#
      • 1...Re4
        • 2.Sg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(b);N_GUARD,P_PINQ(F),P_SPINR(c)::B(A)+P(C)
    • R(b);OGATE,P_SPINR(c)::B(A)+P(C),XR(b)
    • R(b);N_GUARD,P_SPINR(c)::QAB(F),XR(b)
    • R(b);OGATE,P_SPINR(c)::R1(B),XR(c)
    • R(c);N_GUARD,P_PINQ(F),P_SPINR(b)::B(A)+P(C)
    • P(h);OGATEB::QAB(F)
  • Tries
    • Try
      • S(G);XP(f)
      • Threat
        • QAB1(F),XP(h)
      • Vars
        • K(g);S_FLIGHT::QAR2(F),XP(h)
        • P(h);XS(G)::QAB1(F)
        • R(b);N_GUARD,P_PINQ(F),P_SPINR(c)::B(A)+P(C)
        • R(b);OGATE,P_SPINR(c)::R1(B),XR(c)
        • R(c);N_GUARD,P_PINQ(F),P_SPINR(b)::B(A)+P(C)
        • R(c);P_SPINR(b),SBLOCK::S(G)
      • Refutation
        • P(h);
    • Try
      • S(G);
      • Threat
        • QAB1(F),XP(h)
      • Vars
        • K(g);S_FLIGHT::QAR2(F),XP(h)
        • R(b);N_GUARD,P_PINQ(F),P_SPINR(c)::B(A)+P(C)
        • R(b);OGATE,P_SPINR(c)::R1(B),XR(c)
        • R(c);N_GUARD,P_PINQ(F),P_SPINR(b)::B(A)+P(C)
        • R(c);P_SPINR(b),SBLOCK::S(G)
      • Refutation
        • P(h);
    • Try
      • R(B);P_PINR(c),XR(b)
      • Threat
        • DUALS(3)
      • Vars
        • P(f);::QAB(F)
        • P(h);OGATEB::QAB(F)
      • Refutation
        • R(c);N_SPINR(c),XR(B)
    • Try
      • P(C);CHECK
      • Refutation
        • R(c);P_SPINR(b)
    • Try
      • P(C);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b),S_CUTR(c)::B(A),XR(b)
      • Refutation
        • R(c);P_SPINR(b)
  • Actual
    • S(G);
    • Threat
      • QAB1(F),XP(h)
    • Vars
      • K(g);S_FLIGHT::QAR2(F),XP(h)
      • P(h);SBLOCK::S(G)
      • R(b);N_GUARD,P_PINQ(F),P_SPINR(c)::B(A)+P(C)
      • R(b);OGATE,P_SPINR(c)::R1(B),XR(c)
      • R(c);N_GUARD,P_PINQ(F),P_SPINR(b)::B(A)+P(C)
      • R(c);P_SPINR(b),SBLOCK::S(G)
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).