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Problem Display

PID: 230648 (5R2/2Bp3b/8/1K1kP1N1/pn3r2/2Qp4/4Nb1q/8 w - - 0 1)

Makaronets, Leonid

Best Problems, 2021

5R2/2Bp3b/8/1K1kP1N1/pn3r2/2Qp4/4Nb1q/8

#2

7 + 9

SOLUTION

SOUND
Sets
- 1...Qg1
  - 2.Sxf4#
- 1...Qh1
  - 2.Sxf4#
- 1...Qg2
  - 2.Sxf4#
- 1...Qh3
  - 2.Sxf4#
- 1...Qh5
  - 2.Sxf4#
- 1...Qh6
  - 2.Sxf4#
- 1...Rf3
  - 2.Qc4#
- 1...Rc4
  - 2.Qxc4#
- 1...Rd4
  - 2.Qc5#
- 1...Rf5
  - 2.Qc4#
- 1...Rf6
  - 2.Qc4#
- 1...Rf7
  - 2.Qc4#
- 1...Rxf8
  - 2.Qc4#
- 1...Be1
  - 2.Qc5#
- 1...Bg3
  - 2.Qc5#
- 1...Bd4
  - 2.Qc4#
- 1...Bh4
  - 2.Qc5#
- 1...Bc5
  - 2.Qxc5#
- 1...Be4
  - 2.Qc4#
Tries
- 1.Sd4?
  - threat
    - 2.Qc4#
    - 2.Qc5#
  - 1...Rxd4
    - 2.Qc5#
  - 1...Bxd4
    - 2.Qc4#
  - 1...Sa6
    - 2.Qc4#
  - 1...d6!
- 1.Rxf4?
  - threat
    - 2.Qc4#
  - 1...Qxf4
    - 2.Sxf4#
  - 1...d6!
- 1.Rd8?
  - threat
    - 2.Rxd7#
  - 1...Qh3
    - 2.Sxf4#
  - 1...Qh6
    - 2.Sxf4#
  - 1...Rf6
    - 2.Qc4#
  - 1...Rf7
    - 2.Qc4#
  - 1...Bc5
    - 2.Qxc5#
  - 1...d6
    - 2.Rxd6#
  - 1...Bf5!
- 1.Qxb4?
  - threat
    - 2.Sc3#
    - 2.Qd6#
  - 1...dxe2
    - 2.Qd6#
  - 1...d6
    - 2.Qxd6#
  - 1...Qh6
    - 2.Sc3#
    - 2.Sxf4#
  - 1...Rc4
    - 2.Qd6#
    - 2.Qxc4#
  - 1...Rf6
    - 2.Sc3#
    - 2.Qc4#
  - 1...Be1
    - 2.Qc5#
    - 2.Qd6#
  - 1...Bd4
    - 2.Qd6#
    - 2.Qc4#
  - 1...Bc5
    - 2.Sc3#
    - 2.Qxc5#
  - 1...Rxb4+!
- 1.Qd4+?
  - 1...Rxd4
    - 2.Sc3#
  - 1...Bxd4!
- 1.Qb3+?
  - 1...Rc4
    - 2.Qxc4#
  - 1...axb3!
Keys
- 1.Rf6!
  - threat
    - 2.Rd6#
  - 1...Rxf6
    - 2.Qc4#
  - 1...Qh6
    - 2.Sxf4#
  - 1...Rd4
    - 2.Qc5#
  - 1...Bd4
    - 2.Qc4#
  - 1...Bc5
    - 2.Qxc5#
  - 1...d6
    - 2.Rxd6#

This is after 223595

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 14
Sets
- Q(b);N_GUARD::S(A),XR(f)
- R(f);N_GUARD::QAB1(B)
- R(f);N_GUARD::QAB1(B),XR(f)
- R(f);S_CUTB(a)::QAR1(B)
- R(f);N_GUARD,XR(G)::QAB1(B)
- B(a);N_GUARD::QAR1(B)
- B(a);S_CUTR(f)::QAB1(B)
- B(a);N_GUARD::QAR1(B),XB(a)
- B(i);S_CUTR(f)::QAB1(B)
Tries
- Try
  - S(A);
  - Threat
    - DUALS(2)
  - Vars
    - R(f);XS(A)::QAR1(B)
    - B(a);XS(A)::QAB1(B)
    - S(e);::QAB1(B)
  - Refutation
    - P(h);
- Try
  - R(G);XR(f)
  - Threat
    - QAB1(B)
  - Vars
    - Q(b);XR(G)::S(A),XQ(b)
  - Refutation
    - P(h);
- Try
  - R(G);P_PINP(h)
  - Threat
    - R(G),XP(h)
  - Vars
    - Q(b);N_GUARD::S(A),XR(f)
    - R(f);N_GUARD::QAB1(B)
    - B(a);N_GUARD::QAR1(B),XB(a)
    - P(h);OGATE::R1(G),XP(h)
  - Refutation
    - B(i);
- Try
  - Q(B);XS(e)
  - Threat
    - DUALS(2)
  - Vars
    - P(c);XS(A)::QAR1(B)
    - P(h);::QAR1(B),XP(h)
  - Refutation
    - R(f);CHECK,XQ(B)
- Try
  - Q(B);CHECK
  - Vars
    - R(f);SBLOCK,XQ(B)::S(A)
  - Refutation
    - B(a);XQ(B)
- Try
  - Q(B);CHECK
  - Vars
    - R(f);N_GUARD,P_SPINR(f)::QAB1(B),XR(f)
  - Refutation
    - P(d);XQ(B)
Actual
- R(G);
- Threat
  - R1(G)
- Vars
  - R(f);N_GUARD,XR(G)::QAB1(B)
  - Q(b);N_GUARD::S(A),XR(f)
  - R(f);S_CUTB(a)::QAR1(B)
  - B(a);S_CUTR(f)::QAB1(B)
  - B(a);N_GUARD::QAR1(B),XB(a)
  - P(h);::R1(G),XP(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).