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Problem Display

PID: 124307 (4R1b1/2p5/4npBB/3Rbnr1/2Qpk3/2P3P1/K5P1/3N4 w - - 0 1)

Legentil, Georges

Problemes d'Echecs (Legentil), 1951

4R1b1/2p5/4npBB/3Rbnr1/2Qpk3/2P3P1/K5P1/3N4

#2

10 + 9

6490	yacpdb	2009

SOLUTION

SOUND
Sets
- 1...Rxg3
  - 2.Sf2#
- 1...Rg4
  - 2.Sf2#
- 1...Rh5
  - 2.Sf2#
- 1...Rxg6
  - 2.Sf2#
- 1...Bxg3
  - 2.Qxd4#
- 1...Bf4
  - 2.Qxd4#
- 1...Bd6
  - 2.Qxd4#
- 1...Sf4
  - 2.Rxd4#
  - 2.Qxd4#
- 1...Sc5
  - 2.Rxd4#
  - 2.Qxd4#
- 1...Sg7
  - 2.Rxd4#
  - 2.Qxd4#
- 1...Sd8
  - 2.Rxd4#
  - 2.Qxd4#
- 1...Sf8
  - 2.Rxd4#
  - 2.Qxd4#
Tries
- 1.Bxg5?
  - threat
    - 2.Sf2#
  - 1...Bxg3
    - 2.Bxf5#
    - 2.Qxd4#
  - 1...Sxg5
    - 2.Rxd4#
    - 2.Qxd4#
  - 1...Bf4
    - 2.Bxf5#
    - 2.Qxd4#
  - 1...Sf4
    - 2.Rxd4#
    - 2.Qxd4#
  - 1...fxg5!
- 1.Rxd4+?
  - 1...Bxd4
    - 2.Qxd4#
  - 1...Sxd4!
- 1.Rd6?
  - threat
    - 2.Qe2#
  - 1...Rxg3
    - 2.Sf2#
  - 1...Rxg6
    - 2.Sf2#
  - 1...Bxg3
    - 2.Qxd4#
  - 1...Bxd6
    - 2.Qxd4#
  - 1...Bf4
    - 2.Qxd4#
  - 1...Sf4
    - 2.Rxd4#
  - 1...Sc5
    - 2.Rxd4#
  - 1...Sg7
    - 2.Rxd4#
  - 1...Sd8
    - 2.Rxd4#
  - 1...Sf8
    - 2.Rxd4#
  - 1...cxd6!
- 1.Rdd8?
  - threat
    - 2.Qe2#
  - 1...Rxg3
    - 2.Sf2#
  - 1...Rxg6
    - 2.Sf2#
  - 1...Bxg3
    - 2.Qxd4#
  - 1...Bf4
    - 2.Qxd4#
  - 1...Bd6
    - 2.Qxd4#
  - 1...Sf4
    - 2.Rxd4#
  - 1...Sc5
    - 2.Rxd4#
  - 1...Sg7
    - 2.Rxd4#
  - 1...Sf8
    - 2.Rxd4#
  - 1...Sxd8!
Keys
- 1.Rd7!
  - threat
    - 2.Qe2#
  - 1...Rxg3
    - 2.Sf2#
  - 1...Rxg6
    - 2.Sf2#
  - 1...Bxg3
    - 2.Qxd4#
  - 1...Bf4
    - 2.Qxd4#
  - 1...Bd6
    - 2.Qxd4#
  - 1...Sf4
    - 2.Rxd4#
  - 1...Sc5
    - 2.Rxd4#
  - 1...Sg7
    - 2.Rxd4#
  - 1...Sd8
    - 2.Rxd4#
  - 1...Sf8
    - 2.Rxd4#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 5
- REMOVED MATES = 2
Sets
- R(e);XP(E)::S(A)
- R(e);::S(A)
- R(e);N_SPINS(d),XB(H)::S(A)
- B(c);N_GUARD,S_CUTS(f),XP(E)::QAR1(F),XP(a)
- B(c);N_GUARD,S_CUTS(f)::QAR1(F),XP(a)
Tries
- Try
  - B(I);XR(e)
  - Threat
    - S(A)
  - Refutation
    - P(g);XB(I)
- Try
  - R(G);CHECK,XP(a)
  - Vars
    - B(c);OGATE,P_SPINB(c),XR(G)::QAR1(F),XB(c)
  - Refutation
    - S(f);N_SPINS(d),P_PINQ(F),P_SPINB(c),P_SPINS(f),XR(G)
- Try
  - R(G);
  - Threat
    - QAR2(F)
  - Vars
    - R(e);XP(E)::S(A)
    - R(e);N_SPINS(d),XB(H)::S(A)
    - B(c);N_GUARD,S_CUTS(f),XP(E)::QAR1(F),XP(a)
    - B(c);N_GUARD,S_CUTS(f),XR(G)::QAR1(F),XP(a)
    - B(c);N_GUARD,S_CUTS(f)::QAR1(F),XP(a)
    - S(f);N_GUARD,P_PINQ(F),P_SPINB(c)::R1(G),XP(a)
  - Refutation
    - P(h);XR(G)
- Try
  - R(G);
  - Threat
    - QAR2(F)
  - Vars
    - R(e);XP(E)::S(A)
    - R(e);N_SPINS(d),XB(H)::S(A)
    - B(c);N_GUARD,S_CUTS(f),XP(E)::QAR1(F),XP(a)
    - B(c);N_GUARD,S_CUTS(f)::QAR1(F),XP(a)
    - S(f);N_GUARD,P_PINQ(F),P_SPINB(c)::R1(G),XP(a)
  - Refutation
    - S(f);P_PINQ(F),P_SPINB(c),XR(G)
Actual
- R(G);
- Threat
  - QAR2(F)
- Vars
  - R(e);XP(E)::S(A)
  - R(e);N_SPINS(d),XB(H)::S(A)
  - B(c);N_GUARD,S_CUTS(f),XP(E)::QAR1(F),XP(a)
  - B(c);N_GUARD,S_CUTS(f)::QAR1(F),XP(a)
  - S(f);N_GUARD,P_PINQ(F),P_SPINB(c)::R1(G),XP(a)

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).