Circe Power Transfer: A piece moves like the unit occupying its Circe rebirth square (game array squares for Q, R, B & S ; the file of capture for Ps; the promotion square of the file of capture for fairy pieces), if such a unit is present. Kings are not affected unless Rex Inclusive. The standard Circe Power Transfer condition has been programmed by Francois Labelle in Jacobi, other Circe variants (e.g. Vertical Mirror Circe) will, eventually, be added in the future (Cornel Pacurar).
Parry series-mover (phser-): differs from a standard series-mover prior to the last move as follows: the series-side may give check during the series; when checked, the idle-side must immediately parry the threat; a parry-move may be helpful or defensive, depending on the problem-type; after a check-and-parry, the series-side continues the series.
In Anti-parry series (ahser-), the idle side responds to auto-checks, being forced to un-check! (the opposite of Parry-series; see also the full definition by Nicolas Dupont at http://originals.chessproblems.ca/pdf/APS4.pdf)
No.1465Cornel Pacurar Canada original – 28.12.2019
In phser the side to move is White. After the first n-1 moves, during the last move White fulfils the stipulation: stalemate in 1 (in 1465, which should be phser-=11), respectively selfmate in 1 (in 1466, which should be phser-s#7).
If during the series the white King is checked, due to parry, Black is obliged to avoid the check. The ph means that Black cooperates with White when removing the check.
Please play the solution of 1466. The white Queen occupies the rebirth square of the black King, so due to Circe Power Transfer the black King moves like a Queen. During the two phases the white King finds itself checked several times. In a), first two checks are given by the black King, then by the black Pawn. After the black Pawn promotes on white King’s rebirth square, the white King moves like a Bishop.
Something similar happens in the twin: the white King is checked three times by the black King, then two times by the black Pawn. After the black Pawn promotes, the white King moves like a Knight.
In conclusion: we have a superb Wenigsteiner, convincingly exploiting all the involved fairy elements. Hats off, Cornel!
François Labelle
December 28, 2019 17:45
In 1466, the stipulation ahser-s#7 is correct. What’s missing is a definition of Anti-parry series-mover (ahser-). Also, ideally, the auto-checks in the solution should be notated “!+” and not “+!”.
Yes, have added the definition of Anti-parry series; what’s about “!+” – somehow for animation only “+!” works. If it is very important to have the right order, I can add “!+” as a comment to the move, not as the part of it (out of clickable part).
dupont
January 9, 2020 01:19
For those who are not familiar with anti-parry series, here is an explanation of 1466 a):
1.Ka5!+ is an auto-check as black is able to play Kc7xKa5 in Circe power transfert rex inclusive. Black is undoing this auto-check with 1…Kc2 (note than black is helping white to reach the goal – a normal s#1 after a 6-moves long anti-parry series). The second move 2.Ka4!+ Kf2 goes the same way than the first one.
3.Qd7!+ is an auto-check too as black is now able to play d4xKa4 in Circe power transfert. Black is undoing this auto-check with 3…b4. The fourth move 4.Qb7!+ e1=B goes the same way than the third one.
Now the wK is playing like a bishop and the next 2 moves 5.Kc6 6.Kh1 are preparing the goal: 7.Qf3+ It is obviously a check, and the only way for black to parry it is to play 7…Kg1# (for example KxQf3 is illegal as Kh1 is playing like a bishop). It is not difficult to see that this last move is legal and is a checkmate.
dupont
January 10, 2020 18:06
François said: ideally, the auto-checks in the solution should be notated “!+” and not “+!”.
The notation !+ is certainly better than +! but is still a bit ambiguous, as it might be condidered as a good (!) checking move (+).
“Ideally”, I would prefer a single-sign new notation for an auto-check, maybe a circle around the plus (\oplus in TeX).
Kjell Widlert
January 12, 2020 18:24
Quite a good wenigsteiner, once you get used to the unusual kind of play, with analogous strategy to bring the bP to e1 so it can transform the wK into something the bK can mate.
No.1465, 1466 
In phser the side to move is White. After the first n-1 moves, during the last move White fulfils the stipulation: stalemate in 1 (in 1465, which should be phser-=11), respectively selfmate in 1 (in 1466, which should be phser-s#7).
If during the series the white King is checked, due to parry, Black is obliged to avoid the check. The ph means that Black cooperates with White when removing the check.
Please play the solution of 1466. The white Queen occupies the rebirth square of the black King, so due to Circe Power Transfer the black King moves like a Queen. During the two phases the white King finds itself checked several times. In a), first two checks are given by the black King, then by the black Pawn. After the black Pawn promotes on white King’s rebirth square, the white King moves like a Bishop.
Something similar happens in the twin: the white King is checked three times by the black King, then two times by the black Pawn. After the black Pawn promotes, the white King moves like a Knight.
In conclusion: we have a superb Wenigsteiner, convincingly exploiting all the involved fairy elements. Hats off, Cornel!
In 1466, the stipulation ahser-s#7 is correct. What’s missing is a definition of Anti-parry series-mover (ahser-). Also, ideally, the auto-checks in the solution should be notated “!+” and not “+!”.
Yes, have added the definition of Anti-parry series; what’s about “!+” – somehow for animation only “+!” works. If it is very important to have the right order, I can add “!+” as a comment to the move, not as the part of it (out of clickable part).
For those who are not familiar with anti-parry series, here is an explanation of 1466 a):
1.Ka5!+ is an auto-check as black is able to play Kc7xKa5 in Circe power transfert rex inclusive. Black is undoing this auto-check with 1…Kc2 (note than black is helping white to reach the goal – a normal s#1 after a 6-moves long anti-parry series). The second move 2.Ka4!+ Kf2 goes the same way than the first one.
3.Qd7!+ is an auto-check too as black is now able to play d4xKa4 in Circe power transfert. Black is undoing this auto-check with 3…b4. The fourth move 4.Qb7!+ e1=B goes the same way than the third one.
Now the wK is playing like a bishop and the next 2 moves 5.Kc6 6.Kh1 are preparing the goal: 7.Qf3+ It is obviously a check, and the only way for black to parry it is to play 7…Kg1# (for example KxQf3 is illegal as Kh1 is playing like a bishop). It is not difficult to see that this last move is legal and is a checkmate.
François said: ideally, the auto-checks in the solution should be notated “!+” and not “+!”.
The notation !+ is certainly better than +! but is still a bit ambiguous, as it might be condidered as a good (!) checking move (+).
“Ideally”, I would prefer a single-sign new notation for an auto-check, maybe a circle around the plus (\oplus in TeX).
Quite a good wenigsteiner, once you get used to the unusual kind of play, with analogous strategy to bring the bP to e1 so it can transform the wK into something the bK can mate.