[Retros] eight officers homebase mate

[raosorio at fibertel.com.ar]

Hi, 

Jorge Lois and me were enjoying yesterday the surprising Q(sD)/0 position and
PG that Pascal presented and we found the following improvement,

Q(sD)/0 (2,18,0) P. Wassong, J. Lois & R. Osorio 
rsbqkbsr/ppKp1ppp/3B4/8/8/3P4/PPP1PPPP/RS1Q1BSR

wich is half a move less and other side captureless (c=0). I compute it as a
joined composition based on the obvious fact that Pascal made the major
part.

It's nice that both for Q(sD)/0 and Q(sD)/2 the queen makes the equivalent
captureless manouver,

Q(sD)/2 (2,20,2) Roberto Osorio & Jorge Lois 
rsbqkbsr/pp1p1ppp/8/KB6/P7/4PS2/1PP2PPP/1SBQ3R 

This seems to be not posible for Q(sD)/1. What's the better version for this one?

I keep the complete presentation here to make it easy. I included two missing PGs
from Nicolas.

Best,
Roberto Osorio


----------------------------------------------------------------------------------
I present here the task version opened to different king position as 
suggested by Andrew Buchanan. 

I found that it's much reacher and challenging now. There are 32 different 
records to find, both for material and dynamic approach, and some of them 
will be not so easy. 

I include the complete definitions and the Record Table, wich is now plenty 
of room waiting for new achievements. 


EIGHT OFFICERS HOMEBASE MATE - CONCEPTUAL DEFINITION 

CONSTRAINTS 
PG diagram showing a mate position where the mating side has its 8 officers 
at homesquare and the remaining pawns at homesquare too. Standard material 

CASES 
There are 11 different cases based on the checking piece and the checking line. 
Each case has n subcases, represented as /n. The extension /n means the nbr of empty 
squares separating the mating piece and the mated king. Of course, there 
are no subcases for the knight cases. 

R(h)/n - mate by rook on (h) row, n from 2 to 6 
R(a)/n - mate by rook on (a) row, n from 2 to 6 
B(c)/n - mate by c1/c8 bishop, n from 1 to 4 
B(f)/n - mate by f1/f8 bishop, n from 1 to 4 
Q(lD)/n - mate by queen on its homesquare long diagonal, n from 2 to 3 
Q(sD)/n - mate by queen on its homesquare short diagonal, n from 0 to 2 
Q(d)/n - mate by queen on (d) row, n from 2 to 6 
N(b)K(a)- mate by knight from its b1/b8 homesquare and oposite king on a3/a6 
N(b)K(c)- mate by knight from its b1/b8 homesquare and oposite king on c3/c6 
N(g)K(f)- mate by knight from its g1/g8 homesquare and oposite king on f3/f6 
N(g)K(h)- mate by knight from its g1/g8 homesquare and oposite king on h3/h6 

For instance, in the Q(sD) case n=1 defines the king position b3(black king) or 
b6(white king). n=2 defines the king position a4(black king) or a5(white king). 

This way, there are now 32 different cases/subcases, each one having it's own 
potential record. 

The subcase n ranges have been defined as the feseable ones from the geometrical 
point of view without any further consideration. 


TASK DEFINITION 
Defining, 

p: homebase mating side missing pawns 
m: PG single moves 
c: other side missing pieces 

a PG is characterized as (p,m,c). The task asks for economy, so p, m and c have 
to be minimized. Two different orders define two different tasks, 

1) Material task: minimize first p, then m and finally c. 
2) Dynamic task : minimize m, then p and finally c. 


PRESENT RECORD STATUS (nov 24th 2006) 
On the vacancy of a dynamic record the material one is considered to be 
the double record. 

...........MATERIAL TASK......................DYNAMIC TASK 
************************************************************************ 
CASE/n......(p,m,c)...Author....................(p,m,c)....Author 
************************************************************************ 
R(h)/2....- (1,20,2)..Nicolas Dupont 
------------------------------------------------------------------------ 
R(h)/3....- 
------------------------------------------------------------------------ 
R(h)/4 
------------------------------------------------------------------------ 
R(h)/5....-.(1,16,2)..Andrew Buchanan 
------------------------------------------------------------------------ 
R(h)/6....-.(1,14,2)..Andrew Buchanan 
************************************************************************ 
R(a)/2....-.(1,26,3)..Nicolas Dupont 
------------------------------------------------------------------------ 
R(a)/3 
------------------------------------------------------------------------ 
R(a)/4 
------------------------------------------------------------------------ 
R(a)/5 
------------------------------------------------------------------------ 
R(a)/6,,,,-.(1,18,2)..Andrew Buchanan 
************************************************************************ 
B(c)/1 
------------------------------------------------------------------------ 
B(c)/2 
------------------------------------------------------------------------ 
B(c)/3 
------------------------------------------------------------------------ 
B(c)/4....-.(1,28,6)..R.Osorio & J.Lois.........(2,24,1).R.Osorio & J.Lois 
************************************************************************ 
B(f)/1 
------------------------------------------------------------------------ 
B(f)/2....-.(3,20,0).J.Lois & R.Osorio......... 
------------------------------------------------------------------------ 
B(f)/3 
------------------------------------------------------------------------ 
B(f)/4....-.(1,27,3)..J.Lois & R.Osorio 
************************************************************************ 
Q(lD)/2 
------------------------------------------------------------------------ 
Q(lD)/3...-.(1,27,4)..J.Lois & R.Osorio.........(2,18,4).Nicolas Dupont 
************************************************************************ 
Q(sD)/0--- .(2,18,0) Wassong,Lois,Osorio 
------------------------------------------------------------------------ 
Q(sD)/1 
------------------------------------------------------------------------ 
Q(sD)/2...-.(2,20,2)..R.Osorio & J.Lois 
************************************************************************ 
Q(d)/2 
------------------------------------------------------------------------ 
Q(d)/3 
------------------------------------------------------------------------ 
Q(d)/4 
------------------------------------------------------------------------ 
Q(d)/5....-.(1,19,3)..J.Lois & R.Osorio.........(2,17,2).R.Osorio & J.Lois 
------------------------------------------------------------------------ 
Q(d)/6 
************************************************************************ 
N(b)K(a)-.(1,24,4)..R.Osorio & J.Lois 
************************************************************************ 
N(b)K(c)-.(2,25,3).. 
************************************************************************ 
N(g)K(f)-.(3,27,5)..R.Osorio & J.Lois 
************************************************************************ 
N(g)K(h)-.(1,24,4)..J.Lois & R.Osorio 
************************************************************************ 


The proof games 
------------------------------------------------------------------------ 
R(h)/2 (1,20,2) Nicolas Dupont
rsbqkbsr/ppppppp1/8/6RK/6P1/7B/P1PPPP1P/2BQ2SR

R(h)/5 (1,16,2) Andrew Buchanan 
rnbqkbnr/ppppppp1/8/8/4P3/6P1/PPPPN1PK/RNB2BR1 

R(h)/6 (1,14,2) Andrew Buchanan 
rnbqkbnr/ppppppp1/8/8/4P3/3B4/PPPPNPP1/RNB3RK 

R(a)/2 (1,26,3) Nicolas Dupont
rsbqkbsr/1ppppppp/8/KR6/1P4Q1/2P5/PB2PPPP/RS6

R(a)/6 (1,18,2) Andrew Buchanan 
rnbqkbnr/1ppppppp/8/8/3P1Q2/4B3/1PP1PPPP/KR3BNR 

Q(d)/5 (1,19,3) Jorge Lois & Roberto Osorio 
rnb1q3/pppkrp2/2p1p2p/8/8/8/PPP1PPPP/RNBQKBNR 

Q(d)/5 (2,17,2) Roberto Osorio & Jorge Lois 
rnb1qbn1/p1pkppp1/2p1p3/8/8/8/PP2PPPP/RNBQKBNR 

Q(lD)/3 (1,27,4) Jorge Lois & Roberto Osorio 
1n4n1/2q1p3/2pr2pr/6bk/7p/8/PPPP1PPP/RNBQKBNR 

Q(lD)/3 (2,18,4) Nicolas Dupont 
rnbqkbnr/ppp2ppp/8/4P2B/7K/6B1/PP4PP/RN4NR 

Q(sD)/0 (2,18,0) P. Wassong, J. Lois & R. Osorio 
rsbqkbsr/ppKp1ppp/3B4/8/8/3P4/PPP1PPPP/RS1Q1BSR

Q(sD)/2 (2,20,2) Roberto Osorio & Jorge Lois 
rsbqkbsr/pp1p1ppp/8/KB6/P7/4PS2/1PP2PPP/1SBQ3R 

B(f)/4 (1,27,3) Roberto Osorio & Jorge Lois 
1n4n1/rpp3p1/kb3r2/p3p1q1/8/7b/PPPP1PPP/RNBQKBNR 

B(f)/2 (3,20,0) Jorge Lois & Roberto Osorio 
rsbqkbsr/p1p2ppp/8/1PK5/2R5/3P1Q2/1PPP1PPP/1SB2BSR 

B(c)/4 (1,28,6) Jorge Lois & Roberto Osorio 
rnbqkbnr/ppp1pppp/8/2P5/7P/6BK/P3P1PQ/5NN1 

B(c)/4 (2,24,1) Roberto Osorio & Jorge Lois 
rsbqkbsr/ppp2ppp/2P5/8/8/3PP1BK/P2PS1PP/RS1Q1B1R 

N(g)K(h) (1,24,4) Jorge Lois & Roberto Osorio 
rnbqkbnr/ppppppRp/7K/6BP/8/4P3/PP3PP1/1N1Q2N1 

N(g)K(f) (3,27,5) Roberto Osorio & Jorge Lois 
3q1bs1/5p1p/5p2/3p4/4r1b1/5k2/PPP1sP1P/RSBQKBSR 

N(b)K(a) (1,24,4) Roberto Osorio & Jorge Lois 
rnbqkbnr/pRpppppp/K7/PB6/8/3P4/1PP3PP/1N1Q2N1 

N(b)K(c) (2,25,3) Jorge Lois & Roberto Osorio 
rn1q4/pppprpp1/8/8/1bn5/2k5/P1P1PPPP/RNBQKBNR 
-------------------------------------------------------------------------