Crossword solution

The unclued lights (13, 12, 16, 40, 42, 18, 15, 16, 26) reveal Eric Morecambe’s comment about his rendition of Grieg’s Piano Concerto to Andre Previn in their 1971 Christmas special. First prize Stuart Paston, Norwich Runners-up Donald Bain, Edinburgh; John Kitchen, Breachwood Green, Herts

Adjacent pairs in the ordered chain of unclued entries [38] CHAIR, [14] MAN, [25] POWER, [15] STATION, [10] MASTER, [40] KEY, [8] RING, [29] FINGER, [36] POST, [44] CARD and [17] BOARD form single words in their own right. First prize Andy Wallace, Ash Green, Coventry Runners-up Jonathan Jones, Oxford; Elizabeth Duff, London NW5

The twelve unclued lights are names of COMPOSERS whose names begin with or end N to Z. (Martinu ends in U and Quantz covers the Q and Z.) First prize John Nutkins, Brentford Runners-up Diana King, Leeds; Leigh Hughes, Bootle, Merseyside

The thirteen unclued lights are the name of COMPOSERS whose initial letters are A to M. First prize Stephen Rice, London SW1 Runners-up C.R. Haigh, Hassocks, West Sussex; Lynne Gilchrist, Willoughby, NSW, Australia

Unclued lights are some laureates of the Nobel Prize in Physics. There were two CURIEs (35). The clued name was Max BORN (8). The title is an anagram of NOBEL PRIZE. First prize Sid Field, Stockton on Tees Runners-up David Carpenter, Sutton Coldfield G. Asher, Bucknell, Monmouthshire

The key word is GIBBON (highlighted). 1A, 1D and 28D are types of gibbon; 16D is by 18A 29A Gibbon; 32D Gibbon wrote The History of the 13A 38A of the Roman Empire. First prize Anne Clements, Bromley, Kent Runners-up Janet Baines, Winchester, Hants; L. Malone, Dumfries

The unclued lights are STREETS or a phrase including STREET (34A). ST had to be highlighted four times in the grid. First prize Tom Rollinson, Borehamwood, Herts Runners-up Anna Jones, Manton, Wilts; James Bench-Capon, Cambridge

The eight unclued lights are the names of flightless birds, past and present. First prize John Honey, Brockworth, Gloucester Runners-up Fran Morrison, Putney, London SW15; David Dickson, Tarrant Monkton, Dorset

Unclued lights were world CHESS champions. Current champion DING was to be highlighted. First prize Gail Petrie, Brean, Somerset Runners-up Hugh Aplin, London SW19; Philip Grindrod, London W4

Each of the unclued lights (with the pair at 15/26) includes D C C (= 700). First prize Rosamund Campbell, Woodstock, Oxon Runners-up J. Smithies, Vale, Guernsey; William Devison, Shaldon, Devon

The literary scholar F.S. Boas used the term Problem Plays (9D) to refer to a group of Shakespearean plays which seem to contain both comic and tragic elements: Measure for Measure (12/36), All’s Well That Ends Well (39/1) and Troilus and Cressida (21/22). First prize J. Bielawski, Southport Runners-up Alastair Aberdare, London SW13; Jeffrey Frankland,

Reading the title as ‘backup’, unclued answers VOLTE-FACE, RETREAT, SPIN, TURN, COUNTER, BACKTRACK, WITHDRAWAL, ROTATE, RETIREMENT and RECOIL had to be entered in reverse. First prize Wyn Lewis, CarmarthenRunners-up Rhiannon Hales, Ilfracombe, Devon; J.E. Green, St Albans, Herts

The unclued lights are some of the brightest Northern Hemisphere stars. First prize Peter Taylor-Mansfield, Worcester Runners-up Jo Anson, Birmingham; Caroline Arms, Ithaca, NY, USA

The unclued lights can all be followed by STREET. First prize Ken Rae, Nordstrand, Wadbister, Shetland Runners-up Colin Boyce, Heathfield, East Sussex; Margaret Lusk, Fulwood, Lancs

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