The bug is not in fact a bug but it is part of the XBoard protocol.

It sends an SIGINT signal... I don't really know why.

I have disabled it with: feature sigint=0

src/TestXBoardProtocol.java

@@ -19,6 +19,8 @@ public class TestXBoardProtocol {
 		
 		BufferedReader xBoardInput = new BufferedReader(new InputStreamReader(System.in));
 		
+		System.out.println("feature myname=\"djib's Suicide Chess\" sigint=0 sigterm=0 done=1");
+		
 		while (true) {
 			try {
 				String xBoardCommand = xBoardInput.readLine();