# Difference between revisions of "Learning Haskell with Chess"

This page is about learning Haskell using the board game Chess as a running example. The complete code can be found at [1].

# Exercise 1 - Data Types

## Learning Targets

• recapitulate Haskell types (keywords type and data, product and sum types)
• Helium: define equality functions (pattern matching)
• pretty printing

• Define data types that represent boards (Board), squares (Square), positions (Pos), pieces (Piece) and game states (State).
• Helium: Implement suited eq-functions.
• Implement a function prettyBoard::Board->String, that transforms a board into a clearly arranged string representation (human readable :-)). Support this function with auxiliary functions that pretty print pieces, squares, ...
• Define the initial board (initialBoard::Board), test prettyBoard with initialBoard.
• Implement a simple evaluation function evalBoard::Board->Int as the difference of material on board (values: Pawn->1, Knight and Bishop->3, Queen->9, Rook->6, King->"infinity"=1000).

# Exercise 3 - Gametree Generation and Minimax Algorithm

## Learning Targets

• break code in modules
• complexity
• recursive data structures -> recursive algorithms