v1.5.0

STC UHO:
Score of New_16 vs v1.4.0: 175 - 93 - 132  [0.603] 400
...      New_16 playing White: 113 - 24 - 63  [0.723] 200
...      New_16 playing Black: 62 - 69 - 69  [0.482] 200
...      White vs Black: 182 - 86 - 132  [0.620] 400
Elo difference: 72.2 +/- 28.2, LOS: 100.0 %, DrawRatio: 33.0 %

STC Noob_4moves:
Score of New_16 vs v1.4.0: 48 - 14 - 38  [0.670] 100
...      New_16 playing White: 26 - 5 - 19  [0.710] 50
...      New_16 playing Black: 22 - 9 - 19  [0.630] 50
...      White vs Black: 35 - 27 - 38  [0.540] 100
Elo difference: 123.0 +/- 55.2, LOS: 100.0 %, DrawRatio: 38.0 %

README.md

@@ -10,8 +10,6 @@
 
 ### Avalanche is the first and strongest UCI Chess Engine written in [Zig](https://ziglang.org/)
 
-Note: `go depth` and `go movetime` are broken in v1.4.0. This will be fixed in the next release.
-
 ## Strength
 
 **Official [40/15 CCRL ELO (v1.4.0)](http://ccrl.chessdom.com/ccrl/4040/cgi/engine_details.cgi?match_length=30&each_game=0&print=Details&each_game=0&eng=Avalanche%201.4.0%2064-bit#Avalanche_1_4_0_64-bit): 3146**
@@ -74,14 +72,16 @@ Parameter Tuning is done by my [Storming Tune](https://github.com/SnowballSH/sto
 
 ## Changelog
 
-- ### v1.5.0 (+~30 ELO)
+- ### v1.5.0 (+~72 ELO) ~3218 ELO
 
   - Optimizations
+  - Search Tuning
   - Stronger Neural Network
     - Trained on over 25 Million depth 8 positions from lichess elite database
     - Trained on 1.5 Million depth 10 endgame positions
+  - LazySMP Implementation
 
-- ### v1.4.0 (+59 ELO) 3143 ELO
+- ### v1.4.0 (+59 ELO) 3146 ELO
 
   - Search Improvements
   - Manual Tuning

build.zig

@@ -100,12 +100,13 @@ pub fn build(b: *std.build.Builder) void {
         build_options.addOption(usize, "HIDDEN_SIZE", @intCast(usize, hidden_size));
         build_options.addOption(usize, "OUTPUT_SIZE", @intCast(usize, output_size));
     }
-    
+
     build_options.addOption([]const u8, "nnue", "A050823A");
 
     var buf: [64]u8 = undefined;
-    build_options.addOption([]const u8, "version", dtToString(timestamp2DateTime(std.time.timestamp()), &buf));
-    // build_options.addOption([]const u8, "version", "1.5.0");
+    _ = buf;
+    // build_options.addOption([]const u8, "version", dtToString(timestamp2DateTime(std.time.timestamp()), &buf));
+    build_options.addOption([]const u8, "version", "1.5.0");
 
     exe.use_stage1 = true;
 

src/engine/search.zig

@@ -663,6 +663,10 @@ pub const Searcher = struct {
                 // Step 5.6: Late-Move Reduction
                 var reduction: i32 = QuietLMR[@min(depth, 63)][@min(index, 63)];
 
+                if (self.thread_id % 2 == 1) {
+                    reduction -= 1;
+                }
+
                 if (improving) {
                     reduction += 1;
                 }