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proc C L {expr -([lmap c $L {list ++$c*([incr i]%8?$i%2?3*$c3:$c1:0)}])%10==$c}
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proc C L {expr -([lmap c $L {list +([incr i]%8?$i%2?3*$c:$c:0)}])%10==$c}
Try it online!
proc C L {expr -([lmap c $L {list +$c*([incr i]%8?$i%2?3:1:0)}])%10==$c}
proc C L {lmap c $L {incr t [expr [incr i]%8?$i%2?3*$c:$c:0]} expr $c==-$t%10}
proc C L {expr -([lmap c $L {list +[expr +([incr i]%8?$i%2?3*$c:$c:0]0)}])%10==$c}
proc C L {expr -([lmap c $L {list +[expr [incr i]%8?$i%2?3*$c:$c:0]}])%10==$c}
