MESON Chess Problem Database

Problem Display
PID: 50096 (8/2n1p3/1p1pP3/2bn2R1/1p1kp3/1BrqpPN1/1B1NP3/K2R2Q1 w - - 0 1)

Ulanov, Lev

Tidskrift for Schack, 2003

8/2n1p3/1p1pP3/2bn2R1/1p1kp3/1BrqpPN1/1B1NP3/K2R2Q1

#2

11 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qb1+
      • 2.Sxb1#
    • 1...Qc4
      • 2.Sxc4#
    • 1...Qb5
      • 2.Sc4#
    • 1...Qxd2
      • 2.Rxd2#
    • 1...Sb5
      • 2.Rxd5#
    • 1...Sa6
      • 2.Rxd5#
    • 1...Sxe6
      • 2.Rxd5#
    • 1...Sa8
      • 2.Rxd5#
    • 1...Se8
      • 2.Rxd5#
    • 1...exf3
      • 2.Sxf3#
  • Tries
    • 1.Sdxe4?
      • threat
        • 2.Rxd3#
      • 1...Qxd1+
        • 2.Qxd1#
      • 1...Qd2
        • 2.Rxd2#
      • 1...Sf4!
    • 1.fxe4?
      • threat
        • 2.Sf3#
      • 1...Qb1+
        • 2.Sxb1#
      • 1...Qxd2
        • 2.Rxd2#
      • 1...Qa6+!
  • Keys
    • 1.Sc4!
      • threat
        • 2.Sf5#
      • 1...Qxd1+
        • 2.Qxd1#
      • 1...exf3
        • 2.Rxd3#
      • 1...Sf4
        • 2.Qxe3#
      • 1...Sf6
        • 2.Qxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 9
  • Sets
    • Q(b);CHECK::R(B)+S(E),XQ(b)
    • Q(b);::R(B)+S(E),XQ(b)
    • Q(b);::R(B)+S(E)
    • Q(b);OGATE,P_SPINQ(b),XS(E)::R(B),XQ(b)
    • S(k);N_GUARD::R1(J),XS(h)
    • S(k);N_GUARD,XP(K)::R1(J),XS(h)
    • P(f);XP(H)::S(E),XP(f)
  • Tries
    • Try
      • S(E);P_PINQ(b),XP(f)
      • Threat
        • R1(B),XQ(b)
      • Vars
        • Q(b);CHECK,N_SPINQ(b),OGATE,XR(B)::QAR(C),XQ(b)
        • Q(b);OGATEB::R(B),XQ(b)
      • Refutation
        • S(h);
    • Try
      • P(H);XP(f)
      • Threat
        • S(E)
      • Vars
        • Q(b);CHECK::R(B)+S(E),XQ(b)
        • Q(b);OGATE,P_SPINQ(b),XS(E)::R(B),XQ(b)
      • Refutation
        • Q(b);CHECK
  • Actual
    • S(E);P_PINQ(b)
    • Threat
      • S(I)
    • Vars
      • Q(b);CHECK,N_SPINQ(b),OGATE,XR(B)::QAR(C),XQ(b)
      • P(f);N_GUARD,XP(H)::R1(B),XQ(b)
      • S(h);N_GUARD::QAB1(C),XP(c)
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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).