diff --git a/fish/Cargo.toml b/fish/Cargo.toml
index 872eca7..4736e08 100644
--- a/fish/Cargo.toml
+++ b/fish/Cargo.toml
@@ -23,3 +23,7 @@ harness = false
 [[bench]]
 name = "evaluation"
 harness = false
+
+[[bench]]
+name = "think"
+harness = false
diff --git a/fish/benches/think.rs b/fish/benches/think.rs
new file mode 100644
index 0000000..917890a
--- /dev/null
+++ b/fish/benches/think.rs
@@ -0,0 +1,80 @@
+use criterion::{BenchmarkId, Criterion};
+use fish::eval::Weights;
+use mino::srs::PieceType::*;
+use mino::srs::{Piece, Queue};
+use mino::{mat, Mat};
+
+static MATRIX_0: &Mat = mat! {
+    "xxxxxxxx.x";
+    "xxxxxxx.xx";
+    "xxxx.xxxxx";
+    ".xxxxxxxxx";
+    "xxxxx.xxxx";
+    "xxxx.xxxxx";
+    "xxxxxx.xxx";
+    ".xxxxxxxxx";
+    "xxxxx.xxxx";
+};
+static MATRIX_1: &Mat = mat! {
+    "...S..JJJ.";
+    "...SSTLLJZ";
+    ".xxxxxxxxx";
+    "xxxxx.xxxx";
+    "xxxx.xxxxx";
+    "xxxxxx.xxx";
+    ".xxxxxxxxx";
+    "xxxxx.xxxx";
+};
+static MATRIX_2: &Mat = mat! {
+    ".S.T......";
+    ".SSTT.....";
+    "xxxxxxx.xx";
+    "xxxx.xxxxx";
+    "xx.xxxxxxx";
+    "x.xxxxxxxx";
+    "xxxxxxxxx.";
+    "xxx.xxxxxx";
+    "xxxxx.xxxx";
+};
+static MATRIX_3: &Mat = mat! {
+    "..OOSLL...";
+    ".ZOOSSLI..";
+    "ZZZJJSLI..";
+    "xxxxxxxxx.";
+    "xxxxxxxx.x";
+    "xxxxxxxxx.";
+    "xxxxxx.xxx";
+    "xxxxxxx.xx";
+    "xxxxxx.xxx";
+};
+static QUEUE_0: Queue<'_> = Queue::new(None, &[I, S, T, Z, L]);
+static QUEUE_1: Queue<'_> = Queue::new(Some(J), &[O, L, O, I, S]);
+static QUEUE_2: Queue<'_> = Queue::new(Some(S), &[Z, L, J, I, O]);
+static QUEUE_3: Queue<'_> = Queue::new(Some(L), &[S, J, T, Z, I]);
+
+static MATRIX: &[&Mat] = &[MATRIX_0, MATRIX_1, MATRIX_2, MATRIX_3];
+static QUEUE: &[Queue<'_>] = &[QUEUE_0, QUEUE_1, QUEUE_2, QUEUE_3];
+
+const ITERS: u32 = 50_000;
+
+fn think(iters: u32, weights: &Weights, matrix: &Mat, queue: Queue<'_>) -> Option<Piece> {
+    let mut bot = fish::bot::Bot::new(weights, matrix, queue);
+    bot.think_for(iters);
+    bot.suggest()
+}
+
+fn benchmark(c: &mut Criterion) {
+    let mut c = c.benchmark_group("think");
+    c.measurement_time(std::time::Duration::from_secs(10));
+    for i in 0..4 {
+        c.bench_with_input(
+            BenchmarkId::from_parameter(i),
+            &(ITERS, Weights::default(), MATRIX[i], QUEUE[i]),
+            |b, (i, w, m, q)| b.iter(|| think(*i, w, *m, *q)),
+        );
+    }
+    c.finish();
+}
+
+criterion::criterion_group!(benches, benchmark);
+criterion::criterion_main!(benches);