Crossword solution

The unclued lights are card games, as is the puzzle’s title, SNAP. The pair is 15A/29. First prize Mark Rowntree, Greenwich, London SE10 Runners-up Frances Whitehead, Harrogate, N. Yorks; Alan Pink, Crowhurst, E. Sussex

2603 has the prime factors 19 x 137 which further decompose into (102 – 92) x (42 + 112). Therefore the rubric states: ‘puzzle NUMBER is BRACKET TEN SQUARED MINUS NINE SQUARED BRACKET TIMES BRACKET FOUR SQUARED PLUS ELEVEN SQUARED BRACKET’. First prize John Bennett, Havant, HantsRunners-up Julie Sanders, Bishops Waltham, Southampton; Richard Andrews, Ashford, Middlesex

1D / 25D is a quote by 1A. Remaining unclued lights were all anagrams of gemstones: 15A sapphire; 16A ruby; 13D tiger’s eye; 14D garnet; 15D lapis; 23D moonstone. First prize Ann Moore, Lowestoft, Suffolk Runners-up Margaret Almond, Southampton; Neville Twickel, Tidmington, Warwickshire

The unclued are classical composers. First prize Mike Carter, Kirkby Overblow, Harrogate Runners-up Glyn Watkins, Portishead, Bristol; Lewis Osborne, Newton Mearns, Glasgow

The unclued LIGHTS are horse-drawn carriages. First prize Katherine Gwynne, Topsham, Devon Runners-up Ben Stephenson, Ruswarp, N. Yorks;   William Hare, London SE4

The proverb reads ‘A lie will go round the world while truth is pulling its boots on’ (19/7/29/1D/8/10) by C.H. Spurgeon. The unclued lights at 13, 38 and 39 are BOOTS. First prize Janet Burke, Peterborough Runners-up Geoff Lee, London N1, Alan Connor, Kew, Twickenham

The unclued lights are the former and current names of various products: 2/8A, 12/36, 16/32, 17/34, 13/22. First prize David Caldecott, Bowerchalke, Salisbury Runners-up Elizabeth Feinberg, Rancho Mirage, CA, USAPearl Williamson, Dungannon, Northern Ireland

The couple were VICTORIA (23, 36, 37, 45) and ALBERT (2, 9, 17, 20, 46). 7 was the link. First prize Kenneth Allen, Riddlesden, W. YorksRunners-up P. and A. Hoverstadt, Lymm, Cheshire; Christopher Bellew, London W6

RUNNERS (10), ANSWER (28) and MEADOW (29D) defined FIELD; PROVISIONS (18), MANAGE (38) and PASSENGER (30) defined FARE; and THRUSH (11), PICNIC (16) and COMPILER (20) defined FIELDFARE (above the grid) First prize Steve Reszetniak, Margate, Kent Runners-up Alan Norman, Impington, Cambridge; Amanda Spielman, London SW4

The unclued lights each contained a letter which appeared three times. First prize Janet Hill, Eastbourne, East Sussex Runners-up Gareth Davies, Langstone, Newport, Gwent; Andrew Bell, Shrewsbury, Shropshire

The second half of Résumé (ODQ, 8th edition), by Dorothy (‘Dotty’) Parker (‘Nosey’), reads: ‘Guns aren’t lawful; Nooses give; Gas smells awful; You might as well live.’ First prize Peter Berridge, Spalding, Lincolnshire Runners-up Liz Knights, Walton Highway, Cambs; Peter King, Oxford

1A, 7A, 18A, 40A, 46A and 47A are all on the new Elizabeth Line, which appears in the grid when 25A, 26A and 27A are entered correctly. First prize  Nick Huntley, DarlingtonRunners-up  John Fahy, Thaxted, Essex; Heather Weeks, London SW1

The unclued Across lights were some of the radio communications alphabet and the unclued Down lights are part of the current Nato alphabet, all listed under ROGER (solution at 16 Across) in Brewer. ‘Uncle’ and ‘Victor’ are two further examples from the respective alphabets. First prize Revd John Thackray, Ipswich, Suffolk  Runners-up Paul Harrison, Wilpshire,

The theme word was FORD (in line 4), and the sets of unclued lights were 1A, 20, 21 (makes of car), 18, 39, 43 (US presidents), and 11, 31, 33 (characters in The Merry Wives of Windsor). First prize Sue Pounder, Ashton-under-Lyne Runners-up Michael Moran, Penrith, Cumbria; Lucy Robinson, London N16

The seven unclued lights are BIRDs (36) minus one letter: (S)WAN (14), (G)ROUSE (18), P(H)EASANT (22), TE(A)L (40), S(W)ALLOW (7), R(O)OSTER (29) and S(K)IMMER (30). GOSHAWK (in the 9th column) was to be shaded. Title: cf. BI(R)D. First prize Oenone Green, Feltham, MiddlesexRunners-up Robert Stephens, Bearsted, Kent; Julia Jones, Pleshey, Essex

The unclued lights are or were commentators on (sTuMpS) TEST MATCH SPECIAL (which the green highlighted squares revealed). The paired names are 7/24, 8/25, 20/11 and 31/35. First prize Keith Wait, Twickenham, Middlesex Runners-up Jenny Mitchell, Croscombe, Somerset; Mike Garwell, Birmingham

The unclued lights can be followed by BILL. First prize Martin Dey, Hoylandswaine, Sheffield Runners-up M. Willey, Stonesfield, Witney, Oxon; Jean Whitney, Perry Barr, Birmingham

The five of a kind are stations on the Jubilee tube line in London, derived from: 26/27 (London Bridge), 40/41 (Stanmore), 46/47 (Waterloo), 3/34 (Baker Street) and 10/39 (Westminster). LOVELY JUBBLY (32/12D) suggests mispronounced praise. ORATE/ERATO were both accepted at 46A, as were SETTER/TESTER at 34D. Title: the line’s colour on tube maps. First prize

The unclued lights start with the trio JAN, the abbreviation for JANUARY which is ‘this month’ or ‘INST’, the puzzle’s title. First prize Thomas Williamson, Moygashel, Dungannon Runners-up Susan Bell, Reeth, N. Yorks; Richard Thorpe, Burntwood, Staffs

Two unclued lights are a title (three words) and its creator (two words). Remaining unclued lights are four names and eight titles (either singly or paired, including two each of two, three and four words and one of five words), each name being associated with two of the titles. The theme word connecting them all