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Layer from view, and that's because the blend mode of the "Gradient and Squares" layer is set to Normal. When we set the blend mode of a layer to Multiply though, things change. Any areas on the layer that are pure white completely disappear from view, while everything else becomes darker. The only exception is that any areas that are already pure black remain black, since obviously you can't make pure black any darker than it already is. So anything white completely disappears, anything black remains black, and everything else becomes darker.Watch what happens when I change the blend mode of the "Gradient and Squares" layer from Normal to Multiply. Based on what I just said, the white square on the bottom right, along with the white area on the right of the gradient, should completely disappear. The black square on the bottom left, along with the black area on the left of the gradient, should remain black. The 50% gray square, along with the rest of the gradient, should blend in with the solid blue layer below them and become darker. Let's see what happens. First, I'll change the blend mode of the "Gradient and Squares" layer to Multiply:Changing the blend mode of the "Gradient and Squares" layer to Multiply.And now if we look at my Photoshop document, we can see that sure enough, everything has happened exactly as we expected. The white square and white part of the gradient are no longer visible, the black square and black

Above) to obtain four images:an image of white pieces before the movean image of white pieces after the movean image of black pieces before the movean image of black pieces after the movePieces on the board are identified using the open CV's contours function with area threshold. Rectangular bounding boxes are calculated and their coordinates are used to identify the name of the squares with pieces on (a1 .... h8).These square names are stored in sets. Four sets are obtained for each move:set of squares with white pieces before a moveset of squares with black pieces before a moveset of squares with white pieces after a moveset of squares with black pieces after a moveFor white moves sets with white pieces are used, for black moves sets with black pieces.Moves are calculated using the python setdifference(): setdifference(set_squares_of before_move, set_square_after a move)For most moves setdifference() gives two squares: the origin and destination square, thus the move in uci notation. Castling is recognized because here setdifference() results in four squares, which can be assigned to the respective castle move (e1g1, e8g8, e1c1, or e8c8 in uci notation).When FEN string and the move (uci notation) are known, it is possible to convert the move in standard chess notation (SAN), which contains information of the moved piece. The move is validated and if legal the move is used to calculate the new FEN string of the resulting position using python-chess/stockfish functions.The new FEN string is used to update the calculated position image using fen-to-png.Now the cycle repeats, an image is taken, processed, a setdifference() with sets for the color that moves is calculated. This is done each time the lever of the DGT Clock is pressed.The program can handle castling, en passant moves, promotion and underpromotions of pawns.All game data, SAN moves and PGN (Portable Game Notation) are saved to a file. If wanted the program shows the current best move proposal by stockfish and the curent evaluation in an info window.Notation sheet:A notation sheet is shown during the game, saved as a text file and could be printed out during or after the

With a fax machine in aminute or so.Let's imagine for a moment that fax machines haven't beeninvented, but you still want to use the phone. Suppose you need totransmit a one-page document to me. What can you do? Let's make theproblem really easy. Let's say the document can be either a totallyblack page or a totally white one. Now transmitting the document isreally easy. You simply pick up your phone, dial my number, wait forme to answer, and then say either "black" or "white". Okay, let's make the problem a bit harder. Suppose the document isa single page divided into four squares and each of the four areas canbe either black or white. Again, it's fairly easy for you to transmitthis document. You ring me up and just say "Black black whiteblack", "White black white white" or whatever—and I caninstantly recreate the document in my mind's eye at the other end.Now let's make the problem much harder. You have tosend to me an entire page covered in black-and-white,computer-printed words. Actually, this problem isn't as hard as itlooks. All you have to do is divide the page into thousands of gridsquares and then read out, from left to right and from top to bottom,whether each square is black or white. Suppose I'm sitting at theother end of the phone with a piece of paper ruled with an identicalgrid of squares. As you read out "black", "white", "white","black", I just need to shade in all the black squares with apencil and skip