added perft shell script for debugging move generation

perft.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+fen=$1
+qfen="1r3rk1/p1ppq1b1/1n2pnpN/3P4/1p2P3/2N2Q1p/PPPB1PPP/R2BKbR1 b Q - 0 1"
+cfen="r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 1"
+
+# QPerft
+~/projects/qperft/a.out 3 -2 "$qfen" | grep "2\. " | awk '{print $2 " " $5}' | sort > ./output_perft
+
+numlines=$(~/projects/qperft/a.out 3 -2 "$qfen" | grep "2\. " | awk '{print $2 " " $5}' | sort | wc -l)
+
+echo "Total: $numlines" >> ./output_perft
+
+
+
+# Challenger
+~/projects/challenger/build/perft_challenger "$cfen" | awk '{print $1 " " $3}' | sort > ./output_perft_challenger
+
+numchallengerlines=$(~/projects/challenger/build/perft_challenger "$cfen" | awk '{print $1 " " $3}' | sort | wc -l)
+
+echo "Total: $numchallengerlines" >> ./output_perft_challenger
+
+echo "Qperft          Challenger     Move     Number"
+paste ./output_perft ./output_perft_challenger > compare.txt 
+
+cat compare.txt | while read line
+do
+    v1=$(echo $line | awk '{print $2}')
+    v2=$(echo $line | awk '{print $4}')
+    m1=$(echo $line | awk '{print $1}')
+    m2=$(echo $line | awk '{print $3}')
+    if [[ $v1 == $v2 ]]; then
+        echo $line | awk '{print $1 " " $2 "       " $3 " "$4}'
+    else
+        if [[ $m1 == $m2 ]]; then
+            echo "$line                ***"
+        else
+            echo "$line       ***      ***"
+        fi
+    fi
+done
+
+rm ./output_perft ./output_perft_challenger ./compare.txt