diff --git a/DESIGN.md b/DESIGN.md
new file mode 100644
index 0000000..fc2836d
--- /dev/null
+++ b/DESIGN.md
@@ -0,0 +1,33 @@
+# Design
+
+[tabula](https://code.rocket9labs.com/tslocum/tabula) is a multi-threaded backgammon analysis engine.
+To find the best move, the engine performs a series of simulations and scores the resulting game states.
+The result with the lowest score is the best move.
+
+## Scoring
+
+### Space value
+
+Space value is defined as what the term 'pips' would normally refer to. The
+value of a space is the same as the space number as it would appear to the
+player being scored.
+
+### Pseudopips
+
+All scoring calculations use pseudopips.
+
+A pseudopip value is assigned to each board space as follows:
+
+- Each space is worth 6 pseudopips plus **double the space value**.
+- Spaces outside of the player's home board are worth an additional 6 pseudopips.
+
+Space 2 (from the perspective of the player being scored) is therefore worth 10
+pseudopips, space 6 is worth 18, space 7 is worth 26 and the bar space is worth 62.
+
+## Analysis
+
+### Step 1: Simulate all legal move available to the player
+
+### Step 2: Simulate all opponent dice rolls and opponent moves that may follow the above simulations
+
+### Step 3: Sort simulation results by score
diff --git a/board.go b/board.go
index 4f979c2..b7d7489 100644
--- a/board.go
+++ b/board.go
@@ -501,7 +501,9 @@ func opponent(player int) int {
 }
 
 func spaceValue(player int, space int) int {
-	if player == 1 {
+	if space == SpaceBarPlayer || space == SpaceBarOpponent {
+		return 25
+	} else if player == 1 {
 		return space
 	} else {
 		return 25 - space