trial-grids

.KK "4x4 grid"
ABBC
AACC
D1CE
DFFE

A 8+
B 5+
C 11+
D 2-
E 6+
F 1-

.KK "6x6 grid"
6AABBC
DEEFFC
DHEIIJ
DHKK4J
LMNNOO
LMM6PP

A 2/
B 15x
C 2/
D 12+
E 12+
F 3-
H 5-
I 3-
J 1-
K 2/
L 2/
M 12+
N 3-
O 2/
P 7+

.KK "7x7 grid"
3BBCCDE
FGGCCDE
FGHHIJJ
KKLLIMN
OPPQRMN
OSTQRRN
SSTUUVV

B 2/
C 20+
D 2/
E 1-
F 2/
G 24x
H 1-
I 1-
J 4-
K 2-
L 2/
M 6+
N 14x
O 1-
P 3/
Q 3-
R 24x
S 15x
T 2-
U 2/
V 2/

.KK "6x6 grid (hard for logic-based solvers)"
ABBBCC
ADEEFG
HDIIFG
HJJJ5L
MMJNNL
OO3QQQ

A 2-
B 40x
C 5-
D 3-
E 2-
F 3-
G 2-
H 3/
I 7+
J 12+
L 3-
M 1-
N 1-
O 5-
Q 40x