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Problem Display

PID: 250035 (1RQ5/3p1q1b/4pppB/K1N4r/B2R1n2/6b1/1p1Np3/2k1r3 w - - 0 1)

Isaev, Leonid Antonovich

Comm., L'Italia Scacchistica, 1927

1RQ5/3p1q1b/4pppB/K1N4r/B2R1n2/6b1/1p1Np3/2k1r3

#2

8 + 13

6490	yacpdb	2021

SOLUTION

SOUND
Sets
- 1...Rh1
  - 2.Sce4#
  - 2.Sa6#
  - 2.Sxe6#
  - 2.Sb7#
  - 2.Sxd7#
- 1...Rh2
  - 2.Sce4#
  - 2.Sa6#
  - 2.Sxe6#
  - 2.Sb7#
  - 2.Sxd7#
- 1...Rh3
  - 2.Sce4#
  - 2.Sa6#
  - 2.Sxe6#
  - 2.Sb7#
  - 2.Sxd7#
- 1...Rh4
  - 2.Sce4#
  - 2.Sa6#
  - 2.Sxe6#
  - 2.Sb7#
  - 2.Sxd7#
- 1...Rxc5+
  - 2.Qxc5#
- 1...Rxh6
  - 2.Sce4#
  - 2.Sa6#
  - 2.Sxe6#
  - 2.Sb7#
  - 2.Sxd7#
- 1...Sg2
  - 2.Rc4#
- 1...Sd3
  - 2.Rc4#
- 1...Sh3
  - 2.Rc4#
- 1...Sd5
  - 2.Sd3#
- 1...b1Q
  - 2.Rxb1#
- 1...b1S
  - 2.Rxb1#
- 1...b1B
  - 2.Rxb1#
- 1...b1R
  - 2.Rxb1#
- 1...e5
  - 2.Se6#
- 1...f5
  - 2.Sce4#
  - 2.Sa6#
  - 2.Sxe6#
  - 2.Sb7#
  - 2.Sxd7#
- 1...g5
  - 2.Sce4#
- 1...d5
  - 2.Sd7#
Tries
- 1.Bxf4?
  - threat
    - 2.Rc4#
  - 1...Rxc5+
    - 2.Qxc5#
  - 1...b1Q
    - 2.Rxb1#
  - 1...b1S
    - 2.Rxb1#
  - 1...b1B
    - 2.Rxb1#
  - 1...e5
    - 2.Sd3#
    - 2.Se6#
  - 1...g5
    - 2.Sd3#
    - 2.Sce4#
  - 1...d5
    - 2.Sd3#
    - 2.Sd7#
  - 1...Bxf4!
- 1.Qb7?
  - threat
    - 2.Qxb2#
  - 1...b1Q
    - 2.Qxb1#
  - 1...b1S
    - 2.Qxb1#
    - 2.Qb2#
  - 1...b1B
    - 2.Qxb1#
    - 2.Qb2#
  - 1...b1R
    - 2.Qxb1#
  - 1...Sd3
    - 2.Rc4#
  - 1...Rxc5+!
Keys
- 1.Rbb4!
  - threat
    - 2.Rbc4#
  - 1...Rxc5+
    - 2.Qxc5#
  - 1...b1Q
    - 2.Rxb1#
  - 1...b1S
    - 2.Rxb1#
  - 1...b1B
    - 2.Rxb1#
  - 1...b1R
    - 2.Rxb1#
  - 1...Sd5
    - 2.Sd3#
  - 1...e5
    - 2.Se6#
  - 1...g5
    - 2.Sce4#
  - 1...d5
    - 2.Sd7#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 3
Sets
- R(g);CHECK,OGATE,P_SPINR(g),XS(E)::QAR(H),XR(g)
- S(f);::R(C)
- S(f);N_PINS(E)::QAR(H)+S(E),DCHECK
- P(c);OGATE::R1(G),XQ(c)
- P(c);OGATE::R1(G),XS(c)
- P(c);OGATE::R1(G),XB(c)
- P(c);OGATE::R1(G),XR(c)
- P(h);N_PINS(E)::QAR(H)+S(E)
- P(j);N_PINS(E)::QAR(H)+S(E)
- P(k);N_PINS(E)::QAR(H)+S(E)
Tries
- Try
  - B(F);XS(f)
  - Threat
    - R(C)
  - Vars
    - R(g);CHECK,OGATE,P_SPINR(g),XS(E)::QAR(H),XR(g)
    - P(c);OGATE::R1(G),XQ(c)
    - P(c);OGATE::R1(G),XS(c)
    - P(c);OGATE::R1(G),XB(c)
  - Refutation
    - B(e);XB(F)
- Try
  - Q(H);
  - Threat
    - QAB1(H),XP(c)
  - Vars
    - P(c);OGATE::QAR1(H),XQ(c)
    - P(c);OGATE::QAR1(H),XR(c)
    - S(f);::R(C)
  - Refutation
    - R(g);CHECK,XS(E)
Actual
- R(G);
- Threat
  - R(G)
- Vars
  - R(g);CHECK,OGATE,P_SPINR(g),XS(E)::QAR(H),XR(g)
  - P(c);OGATE::R1(G),XQ(c)
  - P(c);OGATE::R1(G),XS(c)
  - P(c);OGATE::R1(G),XB(c)
  - P(c);OGATE::R1(G),XR(c)
  - S(f);N_PINS(E)::QAR(H)+S(E),DCHECK
  - P(h);N_PINS(E)::QAR(H)+S(E)
  - P(j);N_PINS(E)::QAR(H)+S(E)
  - P(k);N_PINS(E)::QAR(H)+S(E)

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).