MESON Chess Problem Database

Problem Display
PID: 250123 (4R2K/2rr1p2/4bN1B/1Qppb1P1/7R/3Pk1p1/5pP1/1N2qB2 w - - 0 1)

Levman, Semyon Semyonovich

2nd Prize, Vecherni Moskva, 1927

4R2K/2rr1p2/4bN1B/1Qppb1P1/7R/3Pk1p1/5pP1/1N2qB2

#2

11 + 11

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ba1
      • 2.g6#
    • 1...Bb2
      • 2.g6#
    • 1...Bc3
      • 2.g6#
    • 1...Bd4
      • 2.g6#
    • 1...Bd6
      • 2.Sxd5#
    • 1...Bxf6+
      • 2.gxf6#
    • 1...Bh3
      • 2.Rxe5#
      • 2.g6#
    • 1...Bf5
      • 2.g6#
    • 1...d4
      • 2.Re4#
  • Tries
    • 1.Qxc5+?
      • 1...Bd4
        • 2.Qxd4#
        • 2.g6#
      • 1...d4
        • 2.Re4#
        • 2.Qxe5#
      • 1...Rxc5!
  • Keys
    • 1.Qb2!
      • threat
        • 2.Qxe5#
      • 1...Bxf6+
        • 2.gxf6#
      • 1...Qxb1
        • 2.Qe2#
      • 1...Qxf1
        • 2.Qd2#
      • 1...Bxb2
        • 2.g6#
      • 1...Qe2
        • 2.Qxe2#
      • 1...Qc3
        • 2.Qe2#
      • 1...Qb4
        • 2.Qe2#
      • 1...Bc3
        • 2.g6#
      • 1...Bd4
        • 2.g6#
      • 1...Bf4
        • 2.Sg4#
      • 1...Bd6
        • 2.Sxd5#
      • 1...Bf5
        • 2.g6#
      • 1...d4
        • 2.Re4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • B(g);N_GUARD,P_SPINB(h)::B(I)+P(G)
    • B(g);N_PINS(H),P_SPINB(h)::S(H),XP(f)
    • B(g);CHECK,OGATE,P_SPINB(h),XS(H)::B(I)+P(G),XB(g)
    • B(h);P_SPINB(g)::B(I)+P(G)
    • P(f);N_GUARD::R1(E)
  • Tries
    • Try
      • Q(F);CHECK,XP(e)
      • Refutation
        • R(i);XQ(F)
  • Actual
    • Q(F);
    • Threat
      • QAR2(F),XB(g)
    • Vars
      • B(g);CHECK,OGATE,P_SPINB(h),XS(H)::B(I)+P(G),XB(g)
      • Q(a);N_GUARD,XS(A)::QAR1(F)
      • Q(a);N_GUARD,XB(B)::QAB1(F)
      • B(g);N_GUARD,P_SPINB(h),XQ(F)::B(I)+P(G)
      • Q(a);N_GUARD::QAR1(F),XQ(a)
      • Q(a);N_GUARD::QAR1(F)
      • B(g);N_GUARD,P_SPINB(h)::B(I)+P(G)
      • B(g);N_PINS(H),P_SPINB(h),SBLOCK::S(H)
      • B(g);N_PINS(H),P_SPINB(h)::S(H),XP(f)
      • B(h);P_SPINB(g)::B(I)+P(G)
      • P(f);N_GUARD::R1(E)
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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).