yep

Shogi.Domain.UnitTests/StandardRulesShould.cs

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+using FluentAssertions;
+using FluentAssertions.Execution;
+using Xunit;
+
+namespace Shogi.Domain.UnitTests
+{
+	public class StandardRulesShould
+	{
+		[Fact]
+		public void AllowValidMoves_AfterCheck()
+		{
+			// Arrange
+			var board = new ShogiBoardState();
+			var rules = new StandardRules(board);
+			rules.Move("C3", "C4"); // P1 Pawn
+			rules.Move("G7", "G6"); // P2 Pawn
+			rules.Move("B2", "G7"); // P1 Bishop puts P2 in check
+			board.InCheck.Should().Be(WhichPlayer.Player2);
+
+			// Act - P2 is able to un-check theirself.
+			/// P2 King moves out of check
+			var moveSuccess = rules.Move("E9", "E8");
+
+			// Assert
+			using var _ = new AssertionScope();
+			moveSuccess.Success.Should().BeTrue();
+			moveSuccess.Reason.Should().BeEmpty();
+			board.InCheck.Should().BeNull();
+		}
+	}
+}