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Problem Display

PID: 132134 (8/4N2Q/r4p2/4PP1K/2n1Bkp1/3R2p1/q2n4/B2N3b w - - 0 1)

Casa, Alex

2nd Prize, L'Echiquier de Paris, 1952

8/4N2Q/r4p2/4PP1K/2n1Bkp1/3R2p1/q2n4/B2N3b

#2

9 + 9

SOLUTION

SOUND
Sets
- 1...Bxe4
  - 2.Qh6#
- 1...Sxe4
  - 2.Sd5#
Tries
- 1.Sf2?
  - threat
    - 2.Sd5#
    - 2.Sg6#
    - 2.Qh6#
  - 1...Qxa1
    - 2.Sg6#
  - 1...Bxe4
    - 2.Qh6#
  - 1...Sxe4
    - 2.Sd5#
  - 1...Sxe5
    - 2.Qh6#
  - 1...fxe5
    - 2.Sd5#
  - 1...Qb2
    - 2.Sg6#
  - 1...Sb2
    - 2.Sg6#
  - 1...Qa5
    - 2.Sg6#
    - 2.Qh6#
  - 1...Ra5
    - 2.Sg6#
    - 2.Qh6#
  - 1...Rd6
    - 2.Sg6#
    - 2.Qh6#
  - 1...Sf3
    - 2.Sd5#
    - 2.Sg6#
  - 1...Sa3
    - 2.Sg6#
    - 2.Qh6#
  - 1...Se3
    - 2.Sg6#
    - 2.Qh6#
  - 1...Sa5
    - 2.Sg6#
    - 2.Qh6#
  - 1...Sb6
    - 2.Sg6#
    - 2.Qh6#
  - 1...Sd6
    - 2.Sg6#
    - 2.Qh6#
  - 1...gxf2!
- 1.Re3?
  - threat
    - 2.Sd5#
    - 2.Sg6#
    - 2.Qh6#
  - 1...Qxa1
    - 2.Sg6#
  - 1...Bxe4
    - 2.Qh6#
  - 1...Sxe4
    - 2.Sd5#
  - 1...Sxe5
    - 2.Qh6#
  - 1...fxe5
    - 2.Sd5#
  - 1...Qb2
    - 2.Sg6#
  - 1...Sb2
    - 2.Sg6#
  - 1...Qa5
    - 2.Sg6#
    - 2.Qh6#
  - 1...Ra5
    - 2.Sg6#
    - 2.Qh6#
  - 1...Rd6
    - 2.Sg6#
    - 2.Qh6#
  - 1...Sf3
    - 2.Sd5#
    - 2.Sg6#
  - 1...Sa3
    - 2.Sg6#
    - 2.Qh6#
  - 1...Sa5
    - 2.Sg6#
    - 2.Qh6#
  - 1...Sb6
    - 2.Sg6#
    - 2.Qh6#
  - 1...Sd6
    - 2.Sg6#
    - 2.Qh6#
  - 1...Sxe3!
Keys
- 1.Sc3!
  - threat
    - 2.Sg6#
  - 1...Kxe5
    - 2.Sg6#
  - 1...Bxe4
    - 2.Se2#
  - 1...Sxe4
    - 2.Scd5#
  - 1...Sxe5
    - 2.Qh6#
  - 1...fxe5
    - 2.Sed5#

This is a version of 115461

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 3
- REMOVED MATES = 0
Sets
- B(a);SBLOCK,XB(D)::QAB(I)
- S(c);SBLOCK,XB(D)::S(H)
Tries
- Try
  - S(B);
  - Threat
    - DUALS(3)
  - Vars
    - Q(b);XB(A)::S(H)
    - B(a);XB(D)::QAB(I)
    - S(c);XB(D)::S(H)
    - S(e);XP(E)::QAB(I)
    - P(i);XP(E)::S(H)
    - Q(b);::S(H)
    - S(e);::S(H)
  - Refutation
    - P(d);XS(B)
- Try
  - R(C);
  - Threat
    - DUALS(3)
  - Vars
    - Q(b);XB(A)::S(H)
    - B(a);XB(D)::QAB(I)
    - S(c);XB(D)::S(H)
    - S(e);XP(E)::QAB(I)
    - P(i);XP(E)::S(H)
    - Q(b);::S(H)
    - S(e);::S(H)
  - Refutation
    - S(e);XR(C)
Actual
- S(B);
- Threat
  - S(H)
- Vars
  - K(f);S_FLIGHT,XP(E)::S(H)
  - B(a);SBLOCK,XB(D)::S(B)
  - S(c);SBLOCK,XB(D)::S(B)
  - S(e);SBLOCK,XP(E)::QAB(I)
  - P(i);SBLOCK,XP(E)::S(H)

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).