I recommend using emojis to share boards when demonstrating hypotheticals.

• 🔴 = wall
• 🔵 = blue dot
• ⚫️ = empty
• 1️⃣2️⃣3️⃣4️⃣5️⃣6️⃣7️⃣8️⃣9️⃣ = “numbered” blue dot with respective number
• #️⃣ = unspecified, numbered blue dot

I also sometimes use ▪️ to represent areas where numbered dots can’t see.

When writing a board, add 4 spaces after each line to make it appear more compact. Here, the .'s represent spaces

⚫️⚫️⚫️2️⃣⚫️....
⚫️1️⃣⚫️⚫️2️⃣....
4️⃣🔴⚫️⚫️⚫️....
⚫️🔴⚫️⚫️⚫️....
⚫️🔴4️⃣4️⃣⚫️

Result:

⚫️⚫️⚫️2️⃣⚫️
⚫️1️⃣⚫️⚫️2️⃣
4️⃣🔴⚫️⚫️⚫️
⚫️🔴⚫️⚫️⚫️
⚫️🔴4️⃣4️⃣⚫️