fix tb bug when nonsense option is active

Elo   | -0.19 +- 1.95 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=32MB
LLR   | 3.01 (-2.94, 2.94) [-4.50, 0.50]
Games | N: 43294 W: 10929 L: 10953 D: 21412
Penta | [596, 5279, 9963, 5171, 638]
https://nonlinear.eu.pythonanywhere.com/test/729/
bench: 2893718

Author: Nonlinear2

src/core.cpp

@@ -342,7 +342,7 @@ int Engine::negamax(int depth, int alpha, int beta, Stack* ss, bool cutnode){
     int static_eval, eval;
 
     // tablebase probe
-    if (tablebase_loaded && TB::probe_wdl(pos, eval)){
+    if (!root_node && tablebase_loaded && TB::probe_wdl(pos, eval)){
         if (nonsense_stage == Nonsense::STANDARD
             || nonsense_stage == Nonsense::CHECKMATE
             || eval == 0)

utils/run_uci_search.cpp

@@ -16,6 +16,13 @@ int main(){
         return 1;
     }
 
+    // uci_engine.process_uci_command("setoption name Hash value 8");
+    // uci_engine.process_uci_command("setoption name Nonsense value true");
+    // uci_engine.process_uci_command("setoption name SyzygyPath value C:/Users/nourb/OneDrive/Desktop/Chess_Engine/engine_executables/3-4-5_pieces_Syzygy/3-4-5");
+    // std::this_thread::sleep_for(std::chrono::milliseconds(2000));
+
+    // uci_engine.engine.load_state("saved_state.bin");
+
     while (std::getline(file, input)) {
         std::cout << "-> " << input << std::endl;
         running = uci_engine.process_uci_command(input);