If they're always squares, perhaps something like this?

WITH Squares

(

Upperleft_X, Upperleft_Y, Upperright_X, Upperright_Y

,Lowerleft_X, Lowerleft_Y, Lowerright_X, Lowerright_Y, Cell

) AS (

SELECT 0, 0, 100, 0, 0, 100, 100, 100, 'A1'

UNION ALL SELECT 0, 101, 100, 101, 0, 200, 100, 200, 'B1'

UNION ALL SELECT 101, 0, 200, 0, 101, 100, 200, 100, 'A2'

UNION ALL SELECT 101, 101, 200, 101, 101, 200, 200, 200, 'B2')

,Points (n, x, y) AS (

SELECT 1, 25, 130

UNION ALL SELECT 2, 105, 40)

SELECT a.n, b.Cell, x, y, Upperleft_X, Upperright_X, Lowerleft_X, Lowerright_X

, Upperleft_Y, Upperright_Y, Lowerleft_Y, Lowerright_Y

FROM Points a

JOIN Squares b

ON (x BETWEEN Upperleft_X AND Lowerright_X AND

y BETWEEN Upperleft_Y AND Lowerright_Y);