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I have KQKPPP
KRKPPP

any other tips would be great , I dont want them all just for space sake but i do want the most critical ones.

Any sugestions would be great

I would say, minimally, get these:

KPPKPP (great for king and pawn endings, of course)
KQPKPP (for when one side just barely outpromotes the other)

KQPKQP (equal material with 1 pawn each)
KRPKRP
KBPKBP
KNPKNP

KQPKRP (major vs. major with 1 pawn each)
KBPKNP (minor vs. minor with 1 pawn each)

Whether you want this one (sometimes the knights win) is a coin toss:

KNNKPP

Just my opinion, of course.

Really I should ask which 6 man TBs are needed that engines would slip into draws without TB help

JAMerolle wrote:Really I should ask which 6 man TBs are needed that engines would slip into draws without TB help

Take the longest win in Queen + Pawn vs. Queen + Pawn. Query the tablebase as you make a subtle change to the position, such as moving 1 piece to a different square close by. Find one position where the change resulted in the "win in 117" becoming a draw.

Now, feed both of them to your program, but WITHOUT the tablebases on.

It would be almost impossible for the program to distinguish between the two, even after a long search. In one case, the win just barely foils the attempt at perpetual check by the loser. In the other case, it must be a perpetual check, or some mutual annihilation that can't be avoided.

Based on that explanation, you tell me which tablebases are most valuable.

thanks for the tip what would be your next 4 sugestions

JAMerolle wrote:I have KQKPPP
KRKPPP

any other tips would be great , I dont want them all just for space sake but i do want the most critical ones.

Any sugestions would be great

Here is the top 50 6-man tablebases by probability of occurrence based on approx. 200,000 computer-computer games (SSDF, CCRL, etc.).

198,884 100.000%

1 krppkr 27,902 14.029%
2 krpkrp 25,779 12.962%
3 kppkpp 19,150 9.629%
4 kpppkp 8,474 4.261%
5 kbpkpp 7,043 3.541%
6 krpkpp 6,966 3.503%
7 knpkpp 6,487 3.262%
8 kbpknp 5,389 2.710%
9 krpkbp 4,648 2.337%
10 kqpkpp 4,630 2.328%
11 kbppkb 3,680 1.850%
12 krppkp 3,529 1.774%
13 knppkn 3,528 1.774%
14 kbppkp 3,499 1.759%
15 knppkp 3,098 1.558%
16 krpknp 3,095 1.556%
17 knppkb 3,083 1.550%
18 knpknp 2,910 1.463%
19 kqpkqp 2,823 1.419%
20 kbpkbp 2,525 1.270%
21 kbppkn 2,514 1.264%
22 kqppkq 2,302 1.157%
23 kqppkp 2,240 1.126%
24 krbpkr 2,181 1.097%
25 kpppkr 2,168 1.090%
26 krbkrp 2,017 1.014%
27 kqpkrp 1,909 0.960%
28 krnpkr 1,875 0.943%
29 kbppkr 1,644 0.827%
30 krnkrp 1,555 0.782%
31 kqrkrp 1,521 0.765%
32 kpppkn 1,243 0.625%
33 knppkr 1,208 0.607%
34 kpppkb 1,124 0.565%
35 kpppkq 1,027 0.516%
36 krppkb 805 0.405%
37 krppkq 789 0.397%
38 krpppk 719 0.362%
39 kqrpkr 670 0.337%
40 krppkn 651 0.327%
41 kqpknp 549 0.276%
42 kqpkbp 531 0.267%
43 kbnpkr 494 0.248%
44 kqpppk 479 0.241%
45 kppppk 456 0.229%
46 kbnpkb 424 0.213%
47 kbpppk 416 0.209%
48 krrkrp 400 0.201%
49 kqbpkp 396 0.199%
50 kqrpkp 381 0.192%

PK

Interesting. How were these figures calculated?

I wonder how many of these endgames were conversion due to extreme time pressure? Some of them seem to be unlikely to even be continued by human players.

I can see why RPP vs. R might be continued, in cases where there are pawns in the f- and h- files (since this can be drawn in practice) and the same for BPP vs. B.

Roughly 50% of chess endgames are rook endgames.

Computers are notoriously bad at those, so getting them is a no-brainer.