From ded1566f530602cb255028b79633e135fe658f3b Mon Sep 17 00:00:00 2001
From: k <markers711@gmail.com>
Date: Tue, 21 Oct 2025 19:49:22 -0400
Subject: [PATCH 1/2] fixed fenGame loading backwords

---
 src/main.zig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/main.zig b/src/main.zig
index f6253df..1cad363 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -60,7 +60,7 @@ fn uciPos(str: []const u8, alloc: std.mem.Allocator) *types.game {
 }
 
 fn fenGame(str: []const u8, alloc: std.mem.Allocator) *types.game {
-    var pos: u8 = 0;
+    var pos: u8 = 63;
     var space: u8 = 0;
     var g = alloc.create(types.game) catch unreachable;
     g.* = std.mem.zeroes(types.game);
@@ -84,7 +84,7 @@ fn fenGame(str: []const u8, alloc: std.mem.Allocator) *types.game {
         const set: *u64 = mov.charToSet(g, chr);
         const bit: u64 = @as(u64, 1) << @truncate(pos);
         set.* |= bit;
-        pos += 1;
+        pos -= 1;
     }
     return g;
 }

From 94b501fd17f1634b99ea35fce475f14ed5f16aef Mon Sep 17 00:00:00 2001
From: k <markers711@gmail.com>
Date: Tue, 21 Oct 2025 19:52:16 -0400
Subject: [PATCH 2/2] knightMove runtime should be working

---
 src/move.zig | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/src/move.zig b/src/move.zig
index 70f0dca..2694870 100644
--- a/src/move.zig
+++ b/src/move.zig
@@ -59,6 +59,32 @@ pub fn charToSet(g: *types.game, chr: u8) *u64 {
 // pub fn pawnMove(arr: std.ArrayList(c.move)) void {
 //     const move = c.move{ .From = 8, .To = 16, .Promo = 0 };
 // }
+
+pub fn knightMove(g: *types.game, arr: *std.ArrayList(types.move)) void {
+    const moveLut: [64]u64 = comptime blk: {
+        var value: [64]u64 = undefined;
+        for (0..64) |i| {
+            value[i] = knightCalc(@truncate(i));
+        }
+        break :blk value;
+    };
+    const set = if (g.whiteToMove) &g.white.knights else &g.black.knights;
+    const fset: u64 = if (g.whiteToMove) @as(u64, c.fullSet(@ptrCast(&g.white))) else @as(u64, c.fullSet(@ptrCast(&g.black)));
+    var val = set.*; //local copy
+    const n = @popCount(val);
+    for (0..n) |_| {
+        const pos = @ctz(val);
+        const moves = moveLut[pos] & ~fset;
+        val = val ^ (@as(u64, 1) << @truncate(pos));
+        bitboardToMoves(pos, moves, arr);
+    }
+}
+
+fn knightCalc(index: u8) u64 {
+    _ = index;
+    return @as(u64,1)<<32;
+}
+
 fn bitboardToMoves(start: u8, moves: u64, arr: *std.ArrayList(types.move)) void {
     var lmoves = moves;
     while (lmoves != 0) {