MESON Chess Problem Database

Problem Display
PID: 225816 (3R2B1/5N2/Kp2p1pq/5P2/pQn1k1P1/1b1p1pP1/1bP1pB2/1Nn5 w - - 0 1)

Ulanov, Lev

Praca, 1997

3R2B1/5N2/Kp2p1pq/5P2/pQn1k1P1/1b1p1pP1/1bP1pB2/1Nn5

#2

11 + 13

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qd2
      • 2.Sxd2#
    • 1...Qg7
      • 2.Sd2#
    • 1...Qf8
      • 2.Sd2#
    • 1...Qh1
      • 2.Sd2#
    • 1...Qh2
      • 2.Sd2#
    • 1...Qh3
      • 2.Sd2#
    • 1...Qh4
      • 2.Sd2#
    • 1...Qh5
      • 2.Sd2#
    • 1...Qh7
      • 2.Sd2#
    • 1...Qh8
      • 2.Sd2#
    • 1...Ba3
      • 2.Sc3#
      • 2.Rd4#
    • 1...Bc3
      • 2.Sxc3#
    • 1...Bd4
      • 2.Rxd4#
    • 1...Sa2
      • 2.cxd3#
    • 1...e5
      • 2.Sd6#
    • 1...g5
      • 2.Sd2#
  • Tries
    • 1.Sd6+?
      • 1...Kd5
        • 2.Qb5#
      • 1...Ke5!
    • 1.Qc5?
      • threat
        • 2.Qc6#
      • 1...Sd2
        • 2.Sd6#
      • 1...Sa3
        • 2.Sd6#
      • 1...Se3
        • 2.Sd2#
        • 2.Sd6#
      • 1...Sa5
        • 2.Sd6#
      • 1...Se5
        • 2.Sd6#
      • 1...Sd6
        • 2.Sxd6#
      • 1...bxc5!
    • 1.Qxc4+?
      • 1...Bd4
        • 2.Sc3#
        • 2.Rxd4#
        • 2.Qxd4#
      • 1...Bxc4+!
    • 1.c3?
      • threat
        • 2.Rd4#
      • 1...Bxc3
        • 2.Sxc3#
      • 1...Qg7
        • 2.Sd2#
      • 1...Qh8
        • 2.Sd2#
      • 1...e5
        • 2.Sd6#
      • 1...Qe3!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Qc6#
      • 1...Sd2
        • 2.Sd6#
      • 1...Sa3
        • 2.Sd6#
      • 1...Se3
        • 2.Sd2#
      • 1...Sa5
        • 2.Sd6#
      • 1...Se5
        • 2.Sd6#
      • 1...Sd6
        • 2.Sxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 15
  • Sets
    • Q(m);N_GUARD::S(A),XQ(m)
    • Q(m);N_GUARD::S(A)
    • B(b);N_GUARD::S(A),XB(b)
    • B(b);N_GUARD,N_SPINS(h)::R1(J),XB(b)
    • S(a);N_GUARD::P(B),XP(e)
    • P(k);SBLOCK::S(I)
    • P(l);S_CUTQ(m)::S(A)
  • Tries
    • Try
      • S(I);CHECK
      • Vars
        • K(i);N_SPINS(h),P_SPINP(k),S_FLIGHT::QAR2(E)
      • Refutation
        • K(i);N_SPINS(h),P-FLIGHT
    • Try
      • Q(E);N_PINS(h)
      • Threat
        • QAB(E)
      • Vars
        • S(h);N_GUARD::S(I)
        • S(h);N_GUARD::S(I),XS(h)
      • Refutation
        • P(j);XQ(E)
    • Try
      • Q(E);CHECK,XS(h)
      • Refutation
        • B(d);CHECK,XQ(E)
    • Try
      • P(B);
      • Threat
        • R1(J)
      • Vars
        • B(b);XP(B)::S(A),XB(b)
        • Q(m);N_GUARD::S(A)
        • P(k);SBLOCK::S(I)
      • Refutation
        • Q(m);
  • Actual
    • Q(E);N_PINS(h)
    • Threat
      • QAB(E)
    • Vars
      • S(h);N_GUARD::S(I)
      • S(h);N_GUARD,S_CUTQ(m)::S(A)
      • S(h);N_GUARD::S(I),XS(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).