async function get_best_move() {
    try {
      const params = new URLSearchParams({
        number_of_decks: 6,
        dealer_up_card_value: "10",
        position_card_values_so_far: ["5", "6"].join(","),
        card_values_seen_so_far: ["10", "5", "6", "2", "3", "4"].join(","),
        is_surrender_allowed: "true",
        blackjack_win_multiplier: "1.5",
        hit_card_simulation_limit_to_save_compute: "3",
      })
      const res = await fetch(`https://www.crushblackjack.com/api/move-expected-value?${params.toString()}`)
      if (!res.ok) {
        throw new Error(`http error ${res.status}`)
      }
      const res_body = await res.json()
      console.log("expected value result:", res_body)
      return res_body
    } catch (err) {
      console.error("fetch error:", err)
      return null
    }
  }

  {
        bust: null,
        blackjack: null,
        stand: {
          ev: -0.5806544619024554,
          outcomes: {
            "0": 0,
            "1": 0.20967276904877227,
            "-1": 0.7903272309512277,
          },
        },
        hit: {
          ev: 0.032002488946088425,
          outcomes: {
            "0": 0.08829462548363258,
            "1": 0.4734932759935231,
            "-1": 0.44149078704743466,
          },
        },
        split: null,
        double: {
          ev: 0.06400497789217685,
          outcomes: {
            "0": 0.08829462548363258,
            "2": 0.4734932759935231,
            "-2": 0.44149078704743466,
          },
        },
        surrender: {
          ev: -0.5,
          outcomes: {
            "-.5": 1,
          },
        },
        best_choice: "double",
      }