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Problem Display

PID: 18372 (3r1r2/3bBp2/2p5/4k3/4N2p/4P3/B5Q1/6K1 w - - 0 1)

Petite, Efren

La Scacchiera, 1955

3r1r2/3bBp2/2p5/4k3/4N2p/4P3/B5Q1/6K1

#2

6 + 7

3105	FIDE Album (1945-1955)	1964

SOLUTION

SOUND
Sets
- 1...Bf5
  - 2.Bf6#
- 1...f5
  - 2.Bd6#
Tries
- 1.Sf2?
  - threat
    - 2.Qe4#
  - 1...Kf5
    - 2.Qe4#
    - 2.Qg5#
  - 1...Bf5
    - 2.Qh2#
  - 1...f5
    - 2.Sd3#
  - 1...Rg8!
- 1.Sc5?
  - threat
    - 2.Qe4#
  - 1...Kf5
    - 2.Qe4#
    - 2.Qg5#
  - 1...Bf5
    - 2.Qh2#
  - 1...f5
    - 2.Sd3#
    - 2.Qb2#
  - 1...Rg8!
- 1.Sd6?
  - threat
    - 2.Qe4#
    - 2.Qb2#
    - 2.Qh2#
  - 1...Rb8
    - 2.Qe4#
    - 2.Qh2#
  - 1...Bf5
    - 2.Qb2#
    - 2.Qh2#
  - 1...f5
    - 2.Qb2#
  - 1...Rg8!
- 1.Qf3?
  - threat
    - 2.Bd6#
    - 2.Bf6#
    - 2.Qf4#
  - 1...Bh3
    - 2.Bf6#
    - 2.Qf4#
  - 1...Bg4
    - 2.Bf6#
    - 2.Qf4#
  - 1...Bf5
    - 2.Bf6#
    - 2.Qf4#
  - 1...Be6
    - 2.Bf6#
    - 2.Qf4#
  - 1...Bc8
    - 2.Bf6#
    - 2.Qf4#
  - 1...Be8
    - 2.Bf6#
    - 2.Qf4#
  - 1...f5
    - 2.Bd6#
    - 2.Qf4#
  - 1...f6
    - 2.Bd6#
    - 2.Qf4#
  - 1...Rg8+!
- 1.Qg4?
  - threat
    - 2.Bd6#
    - 2.Bf6#
    - 2.Qf4#
  - 1...Rg8
    - 2.Bd6#
    - 2.Bf6#
  - 1...Bf5
    - 2.Bf6#
    - 2.Qf4#
  - 1...Be6
    - 2.Bf6#
    - 2.Qf4#
  - 1...Bc8
    - 2.Bf6#
    - 2.Qf4#
  - 1...Be8
    - 2.Bf6#
    - 2.Qf4#
  - 1...f5
    - 2.Bd6#
    - 2.Qf4#
  - 1...f6
    - 2.Bd6#
    - 2.Qf4#
  - 1...Bxg4!
- 1.Qg5+?
  - 1...Bf5
    - 2.Qf4#
  - 1...f5
    - 2.Qf4#
  - 1...Kxe4!
Keys
- 1.Sg5!
  - threat
    - 2.Qe4#
  - 1...Kf5
    - 2.Qe4#
  - 1...Bf5
    - 2.Qh2#
  - 1...f5
    - 2.Qb2#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 2
- ADDED MATES = 1
- REMOVED MATES = 0
Sets
- B(d);SBLOCK::B(F)
- P(e);SBLOCK::B(F)
Tries
- Try
  - S(E);
  - Threat
    - QAR1(C)
  - Vars
    - B(d);SBLOCK::QAB(C)
    - P(e);SBLOCK::S(E)
  - Refutation
    - R(g);P_PINQ(C)
- Try
  - S(E);
  - Threat
    - QAR1(C)
  - Vars
    - B(d);SBLOCK::QAB(C)
  - Refutation
    - R(g);P_PINQ(C)
- Try
  - S(E);
  - Threat
    - DUALS(3)
  - Vars
    - P(e);::QAB(C)
  - Refutation
    - R(g);P_PINQ(C)
- Try
  - Q(C);
  - Threat
    - DUALS(3)
  - Refutation
    - R(g);CHECK
- Try
  - Q(C);
  - Threat
    - DUALS(3)
  - Refutation
    - B(d);XQ(C)
- Try
  - Q(C);CHECK
  - Vars
    - B(d);P_SPINB(d)::QAB1(C)
    - P(e);P_SPINP(e)::QAB1(C)
  - Refutation
    - K(b);P-FLIGHT,XS(E)
Actual
- S(E);
- Threat
  - QAR1(C)
- Vars
  - K(b);P-FLIGHT::QAB1(C)
  - B(d);SBLOCK::QAB(C)
  - P(e);SBLOCK::QAB(C)

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).