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Problem Display

PID: 171434 (4K3/4N3/3pk3/4P3/Q7/4n3/8/8 w - - 0 1)

Antipov, Viacheslav Pavlovich

Shakh-M (Borovich), 1998

4K3/4N3/3pk3/4P3/Q7/4n3/8/8

#2

4 + 3

6490	yacpdb	2018

SOLUTION

SOUND
Sets
- 1...dxe5
  - 2.Qc6#
  - 2.Qa6#
Tries
- 1.Qb5?
  - 1...dxe5
    - 2.Qa6#
    - 2.Qc6#
    - 2.Qb6#
  - 1...Sd5
    - 2.Qxd5#
  - 1...Sd1
    - 2.Qd5#
  - 1...Sf1
    - 2.Qd5#
  - 1...Sc2
    - 2.Qd5#
  - 1...Sg2
    - 2.Qd5#
  - 1...Sc4
    - 2.Qd5#
  - 1...Sg4
    - 2.Qd5#
  - 1...Sf5
    - 2.Qd5#
  - 1...d5!
- 1.Qc6?
  - threat
    - 2.Qxd6#
  - 1...Sc4
    - 2.Qd5#
  - 1...Sf5
    - 2.Qd5#
  - 1...Kxe5!
- 1.Qd4?
  - threat
    - 2.Qxd6#
  - 1...dxe5
    - 2.Qb6#
  - 1...Sc4
    - 2.Qd5#
  - 1...Sd5
    - 2.Qxd5#
  - 1...Sf5
    - 2.Qd5#
  - 1...d5!
- 1.Qe4?
  - 1...dxe5
    - 2.Qc6#
    - 2.Qg6#
  - 1...Sc4
    - 2.Qd5#
    - 2.Qf5#
  - 1...Sd1
    - 2.Qd5#
    - 2.Qf5#
  - 1...Sf1
    - 2.Qd5#
    - 2.Qf5#
  - 1...Sc2
    - 2.Qd5#
    - 2.Qf5#
  - 1...Sg2
    - 2.Qd5#
    - 2.Qf5#
  - 1...Sg4
    - 2.Qd5#
    - 2.Qf5#
  - 1...Sd5
    - 2.Qxd5#
    - 2.Qf5#
  - 1...Sf5
    - 2.Qd5#
    - 2.Qxf5#
  - 1...d5!
- 1.Qa5?
  - 1...dxe5
    - 2.Qb6#
    - 2.Qa6#
  - 1...Sd5
    - 2.Qxd5#
  - 1...Sc4
    - 2.Qd5#
  - 1...Sd1
    - 2.Qd5#
  - 1...Sf1
    - 2.Qd5#
  - 1...Sc2
    - 2.Qd5#
  - 1...Sg2
    - 2.Qd5#
  - 1...Sg4
    - 2.Qd5#
  - 1...Sf5
    - 2.Qd5#
  - 1...d5!
Keys
- 1.Qf4!
  - threat
    - 2.Qf6#
  - 1...dxe5
    - 2.Qh6#
  - 1...Sg4
    - 2.Qf5#
  - 1...Sd5
    - 2.Qf5#
  - 1...Sf5
    - 2.Qxf5#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 0
Sets
Tries
- Try
  - Q(A);
  - Vars
    - S(a);N_GUARD::QAB1(A),XS(a)
    - S(a);N_GUARD::QAB1(A)
  - Refutation
    - P(b);
- Try
  - Q(A);P_PINP(b)
  - Threat
    - QAR1(A),XP(b)
  - Vars
    - S(a);N_GUARD::QAB1(A)
  - Refutation
    - K(c);N_SPINP(b),P-FLIGHT,XP(B)
- Try
  - Q(A);
  - Threat
    - QAR1(A),XP(b)
  - Vars
    - P(b);OGATEB,SBLOCK,XP(B)::QAR(A)
    - S(a);N_GUARD::QAB1(A)
    - S(a);N_GUARD::QAB1(A),XS(a)
  - Refutation
    - P(b);
- Try
  - Q(A);
  - Refutation
    - P(b);
- Try
  - Q(A);
  - Vars
    - S(a);N_GUARD::QAB1(A),XS(a)
    - S(a);N_GUARD::QAB1(A)
  - Refutation
    - P(b);
Actual
- Q(A);
- Threat
  - QAR1(A)
- Vars
  - P(b);SBLOCK,XP(B)::QAR(A)
  - S(a);N_GUARD::QAB1(A)
  - S(a);N_GUARD::QAB1(A),XS(a)

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