# Cricket

A true 3D, in-browser cricket contest, played under the MCC Laws of Cricket
(2017 Code 4th Edition - 2026). Batting and bowling only: the pitch, the ball,
the stumps and the dismissal Laws are the game, and the field is a fixed ring
you cannot move. No account, no network calls, no tracking; everything runs on
the page.

## What is faithful

- Every dimension is a Law's own figure: Law 6.1 (pitch), Law 7 (creases, each
  defined at the stated EDGE of its marking), Law 8 (stumps and bails),
  Law 4.1 (ball), Law 5 (bat), Law 17.1 (the over), Law 19.6.2 (boundaries).
- Law 36 (Leg before wicket) is implemented as the conjunction of all five of
  its clauses, each reported separately, and proved exhaustively against an
  independent rule oracle over 294,912 cases.
- Law 21 (No ball) and Law 22 (Wide ball) are implemented clause by clause and
  proved the same way.
- Law 29.1's "completely removed" criterion for a broken wicket, with a
  threshold derived from the bail geometry Law 8.3 fixes.

## The physics

The ball's raised seam trips the boundary layer on one side only, so it swings
towards the seam side below a critical speed and reverses above it. The model is
fitted to wind-tunnel measurements in R. D. Mehta, "Cricket Ball Aerodynamics:
Myth Versus Science", NASA Ames Research Center (NTRS 20000112958), and
reproduces his three measured reversal speeds: 100 mph for a new two-piece ball,
80 mph for a new four-piece match ball and 65 mph for one about 100 overs old.
Drag and bounce follow R. Cross, "The Physics of Cricket", University of Sydney.

## Author

An independent reimplementation. Cricket is a folk game of no single author; the
Laws have been governed by Marylebone Cricket Club since 1787. Not affiliated
with, endorsed by or connected to MCC.