diff --git a/src/main/java/commanderailab/batch/BatchRunner.java b/src/main/java/commanderailab/batch/BatchRunner.java
index 2f7edf7..3315b68 100644
--- a/src/main/java/commanderailab/batch/BatchRunner.java
+++ b/src/main/java/commanderailab/batch/BatchRunner.java
@@ -557,8 +557,13 @@ public class BatchRunner {
         Map<String, String> lossReasons = new HashMap<>();
 
         // ── Issue #1: Track last-known life totals from verbose log ──────
-        int[] lastKnownLife = {40, 40, 40};  // Start at Commander default
-        boolean[] lifeTracked = {false, false, false};
+        int numPlayers = decks.size();
+        int[] lastKnownLife = new int[numPlayers];
+        boolean[] lifeTracked = new boolean[numPlayers];
+        for (int i = 0; i < numPlayers; i++) {
+            lastKnownLife[i] = 40;  // Commander starting life
+            lifeTracked[i] = false;
+        }
         Set<Integer> loserSeats = new HashSet<>();
 
         for (String line : lines) {
@@ -1060,7 +1065,8 @@ public class BatchRunner {
 
         // Track current turn per seat
         int globalTurn = 0;
-        boolean[] openingHandPhase = {true, true, true}; // before first turn
+        boolean[] openingHandPhase = new boolean[decks.size()];
+        java.util.Arrays.fill(openingHandPhase, true); // before first turn
 
         for (String rawLine : lines) {
             String line = rawLine.trim();
diff --git a/src/main/java/commanderailab/cli/LabCli.java b/src/main/java/commanderailab/cli/LabCli.java
index 5ad10ca..4cd31bf 100644
--- a/src/main/java/commanderailab/cli/LabCli.java
+++ b/src/main/java/commanderailab/cli/LabCli.java
@@ -383,6 +383,7 @@ public class LabCli implements Callable<Integer> {
         result.metadata.masterSeed = masterSeed;
         result.metadata.threads = threads;
         result.metadata.elapsedMs = elapsedMs;
+        result.metadata.podSize = decks.size();
         result.decks = decks;
         result.games = games;
         result.summary = summary;
diff --git a/src/main/java/commanderailab/schema/JsonExporter.java b/src/main/java/commanderailab/schema/JsonExporter.java
index 6d98343..cf13130 100644
--- a/src/main/java/commanderailab/schema/JsonExporter.java
+++ b/src/main/java/commanderailab/schema/JsonExporter.java
@@ -62,11 +62,11 @@ public class JsonExporter {
         try {
             BatchResult result = GSON.fromJson(json, BatchResult.class);
             return result.metadata != null
-                    && result.decks != null && result.decks.size() == 3
+                    && result.decks != null && result.decks.size() >= 3 && result.decks.size() <= 4
                     && result.games != null
                     && result.summary != null
                     && result.metadata.schemaVersion.equals("1.0.0")
-                    && result.metadata.podSize == 3;
+                    && result.metadata.podSize >= 3 && result.metadata.podSize <= 4;
         } catch (Exception e) {
             return false;
         }