diff --git a/2023/inputs/day23 b/2023/inputs/day23
new file mode 100644
index 0000000..24abcfe
--- /dev/null
+++ b/2023/inputs/day23
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+#.#######.#.#.#.#####.###.#.###########.#.#.#.#.###.#.#.#.#v#.#.###.#.#.#.#.#.###.#.#v#.#.#.#.#####.#.###.#.#####.#.#####.###.#.#.#.###.#.#.#
+#.#...#...#.#.#.#.....###.#.#...........#.#.#.#...#.#.#.#.>.>.#.#...#.#.#.#.#.#...#.>.>.#.#.#.#...#.#...#.#...#...#.#...#.#...#.#.#.#...#.#.#
+#.#.#.#.###.#.#.#.#######.#.#.###########.#.#.###.#.#.#.#######.#.###.#.#.#.#.#.#########.#.#.#.#.#.###.#.###.#.###.#.#.#.#.###.#.#.#.###.#.#
+#...#...###...#...#######...#.............#...###...#...#######...###...#...#...#########...#...#...###...###...###...#...#.....#...#.....#.#
+###########################################################################################################################################.#
diff --git a/2023/src/bin/day23.rs b/2023/src/bin/day23.rs
new file mode 100644
index 0000000..f611204
--- /dev/null
+++ b/2023/src/bin/day23.rs
@@ -0,0 +1,90 @@
+#![feature(test, try_blocks)]
+extern crate test;
+use aoc2023::{boilerplate, common::*};
+use fnv::FnvHashSet as Set;
+use std::mem::transmute;
+
+#[repr(u8)]
+#[allow(dead_code)]
+#[derive(Debug)]
+// Left and Up don’t actually appear in any outputs
+enum Tile {
+    Empty = b'.',
+    Forest = b'#',
+    SlopeRight = b'>',
+    SlopeDown = b'v',
+}
+
+const DAY: usize = 23;
+type Parsed<'a> = Vec<&'a [Tile]>;
+type Pos = (usize, usize);
+const START: Pos = (0, 1);
+
+fn parse_input(raw: &str) -> Parsed {
+    raw.lines().map(|l| unsafe { transmute(l) }).collect()
+}
+
+fn step(parsed: &Parsed, visited: Set<Pos>, p: Pos, steps: usize) -> Option<usize> {
+    let candidates: Vec<Option<Pos>> = match parsed[p.1][p.0] {
+        Tile::SlopeDown => vec![Some((p.0, p.1 + 1))],
+        Tile::SlopeRight => vec![Some((p.0 + 1, p.1))],
+        _ => vec![try { (p.0.checked_sub(1)?, p.1) }, Some((p.0 + 1, p.1)), try { (p.0, p.1.checked_sub(1)?) }, Some((p.0, p.1 + 1))],
+    };
+    candidates
+        .into_iter()
+        .flatten()
+        .filter(|&(x, y)| !visited.contains(&(x, y)))
+        .filter_map(|(x, y)| match try { parsed.get(y)?.get(x)? } {
+            None => Some(steps + 1),
+            Some(Tile::Empty) => {
+                let mut visited = visited.clone();
+                visited.insert((x, y));
+                step(parsed, visited, (x, y), steps + 1)
+            }
+            _ => None,
+        })
+        .max()
+}
+
+fn part1(parsed: &Parsed) -> usize {
+    let end = (parsed.len() - 1, parsed[0].len() - 2);
+    step(parsed, Set::default(), START, 0).unwrap()
+}
+
+fn part2(parsed: &Parsed) -> usize {
+    unimplemented!()
+}
+
+boilerplate! {
+    TEST_INPUT == "\
+#.#####################
+#.......#########...###
+#######.#########.#.###
+###.....#.>.>.###.#.###
+###v#####.#v#.###.#.###
+###.>...#.#.#.....#...#
+###v###.#.#.#########.#
+###...#.#.#.......#...#
+#####.#.#.#######.#.###
+#.....#.#.#.......#...#
+#.#####.#.#.#########v#
+#.#...#...#...###...>.#
+#.#.#v#######v###.###v#
+#...#.>.#...>.>.#.###.#
+#####v#.#.###v#.#.###.#
+#.....#...#...#.#.#...#
+#.#########.###.#.#.###
+#...###...#...#...#.###
+###.###.#.###v#####v###
+#...#...#.#.>.>.#.>.###
+#.###.###.#.###.#.#v###
+#.....###...###...#...#
+#####################.#"
+    for tests: {
+        part1: { TEST_INPUT => 94 },
+        part2: { TEST_INPUT => 0 },
+    },
+    bench1 == 0,
+    bench2 == 0,
+    bench_parse: Vec::len => 141,
+}
diff --git a/2023/src/position.rs b/2023/src/position.rs
index 4b4f674..04902b4 100644
--- a/2023/src/position.rs
+++ b/2023/src/position.rs
@@ -8,6 +8,7 @@ use std::{
 };
 
 #[derive(Hash, PartialEq, Eq, Debug, Clone, Copy)]
+#[repr(transparent)]
 pub struct PositionND<I, const DIMS: usize>(pub [I; DIMS]);
 
 pub type Position2D<I> = PositionND<I, 2>;