 
Problems
Categorised by Difficulty Rating
From
January 1974, all problems published in my competitions have had a Difficulty
Rating (DR) from 1 (much too easy) to 8 (extremely difficult) assigned, for the
purposes of my Double Dummy Master Points Scheme. Problems with the same
DR are chained together by "next DRn" and "previous DRn"
links. The DRs for problems
that appeared before that have DRs proposed by ace solver JeanMarc
Bihl, who very kindly undertook the task after he had submitted solutions
(nearly all correct) to problems #1 to #212.
DR1
problems
#68,
#77,
#119,
#155, #172, #187,
#229, #387,
#396, #409,
#410, #412, #416,
#434,
#463, #466, EB#1,
EB#2, EB#3, EB#4,
EB#5,
EB#6, EB#7, EB#8,
EB#9,
EB#12,
EB#14,
EB#15, EB#17,
EB#18, EB#20,
EB#21,
EB#22, EB#25,
EB#30,
EB#36, EB#37,
EB#41,
EB#42, EB#49, EB#51,
EB#52, EB#53, EB#54,
EB#55, EB#56,
Y#1, Y#2,
Y#3,
Y#5,
Y#6,
Y#9, Y#10,
Y#16, Y#17,
Y#22, Y#23, Y#24,
Y#29, Y#30,
Y#32, PAC#1, PAC#2,
PAC#4, PAC#5,
PAC#7, PAC#8, PAC#9,
PAC#10, PAC#11, PAC#12,
PAC#14, PAC#17, PAC#18,
PAC#20, PAC#21, PAC#22,
PAC#23, PAC#24, PAC#27,
PAC#30,
PAC#35, PAC#37, PAC#38, CC#1,
CC#2, CC#4, CC#6,
CC#7,
CC#10, CC#11,
CC#12,
CC#13, CC#14, CC#20, CC#21,
CC#22, CC#23, CC#24, CC#27,
CC#28,
CC#32,
CC#33,
CC#34, CC#35, CC#36, CC#38,
CC#40, CC#47, CC#48,
CC#52,
CC#55,
CC#62,
CC#68, CC#76, CC#79, CC#80,
CC#81, CC#82,
CC#89,
CC#92,
CC#98,
CC#99,
CC#109, CC#110, CC#111,
CC#117,
CC#137,
CC#140, CC#142,
CC#157, CC#159,
CC#161,
CC#162, CC#163,
CC#164, CC#165,
CC#169,
CC#182, CC#183,
CC#184,
CC#186, CC#191,
CC#193, CC#194, CC#195, CC#196,
CC#202,
CC#203, CC#204, CC#205, CC#206, CC#207, CC#208, CC#209,
CC#210, CC#212, CC#213, CC#216,
CC#217, CC#218,
CC#221,
CC#229, CC#233, CC#234,
CC#239,
CC#241,
CC#242, CC#243, CC#244,
CC#245,
CC#246, CC#247, CC#248,
CC#249, CC#254, CC#255,
CC#256, CC#257, CC#258, CC#260,
CC#262, CC#263, CC#268,
CC#270, CC#288, CC#294, CC#303,
CC#304, CP#082b,
CP#097b, CP#112b,
CP#118c, CP#137b.
DR2
problems
#6,
#12,
#35, #40,
#72, #84, #87,
#110, #121,
#154, #174,
#178, #197, #198,
#204, #206,
#216, #218, #223,
#273, #275, #287,
#294, #297, #308,
#312, #313, #314,
#318, #321, #349,
#373,
#407,
#418, #422, #425,
#427,
#429, #435, #437,
#441, #443,
#449, #453, #455,
#457, #461,
#465,
#487, #492,
EB#10, EB#11, EB#13, EB#16, EB#24, EB#26,
EB#28,
EB#29,
EB#31, EB#32,
EB#33,
EB#38,
EB#39,
EB#40,
Y#4,
Y#7,
Y#11, Y#12,
Y#18,
Y#19,
Y#20,
Y#21, Y#25,
Y#28, PAC#3,
PAC#6,
PAC#13,
PAC#15, PAC#16,
PAC#19,
PAC#26, PAC#28, PAC#29,
PAC#31,
PAC#34,
PAC#36,
CC#5,
CC#8, CC#9, CC#15,
CC#16, CC#17, CC#19,
CC#25,
CC#30, CC#37, CC#41,
CC#42,
CC#43, CC#45, CC#49,
CC#50,
CC#51,
CC#56, CC#57, CC#58,
CC#59, CC#60, CC#61,
CC#65,
CC#69, CC#71, CC#75,
CC#77,
CC#83, CC#84, CC#85,
CC#87, CC#88, CC#90,
CC#91,
CC#93, CC#94, CC#95,
CC#96, CC#97,
CC#101, CC#105, CC#108,
CC#112,
CC#113,
CC#114, CC#115,
CC#116,
CC#118,
CC#124,
CC#125,
CC#127,
CC#130,
CC#131, CC#132,
CC#133, CC#134, CC#135,
CC#136, CC#138,
CC#141,
CC#154, CC#156, CC#160,
CC#170, CC#171, CC#172,
CC#174, CC#175, CC#176,
CC#177, CC#181,
CC#185,
CC#187,
CC#188, CC#189, CC#190,
CC#192, CC#197, CC#198,
CC#214, CC#222, CC#223,
CC#226, CC#227, CC#230,
CC#231,
CC#237, CC#238, CC#250,
CC#251, CC#259, CC#264,
CC#267, CC#272, CC#274,
CC#275, CC#281, CC#283,
CC#291, CC#293, CC#295,
CC#296, CP#035, CP#038, CP#062,
CP#071, CP#082a,
CP#083, CP#094a,
CP#096a, CP#101b,
CP#104b,
CP#107b, CP#108b, CP#113b,
CP#114b, CP#117b,
CP#118b, CP#123b,
CP#127b, CP#131b,
CP#135b, CP#139b,
CP#143b, CP#145b,
CP#152b, CP#154b,
CP#162b, CP#177b.
CP#178. DR3
problems
#3,
#13,
#22, #25, #28,
#34, #37, #42,
#43, #57, #66,
#76,
#91,
#92, #100,
#105, #107, #113,
#123,
#124, #131, #134, #135,
#146, #161, #162,
#185, #217, #219,
#225, #234, #246, #257,
#269, #272, #277,
#278, #279, #281,
#302, #304, #309, #328,
#342, #343, #358,
#365,
#368, #379, #391,
#400, #401,
#404, #424,
#446,
#447, #451, #459,
#470, #477,
#478,
#483, #489, #501,
#511, #512,
EB#19,
EB#23,
EB#35,
EB#43, Y#13,
Y#14, Y#26,
Y#27, Y#31, PAC#25,
PAC#33, CC#26, CC#31,
CC#39, CC#44,
CC#46,
CC#54,
CC#64, CC#70, CC#74,
CC#78, CC#100, CC#103, CC#104,
CC#107, CC#120,
CC#122,
CC#128, CC#143, CC#145, CC#158,
CC#167, CC#168, CC#173,
CC#178, CC#179,
CC#200,
CC#211, CC#215, CC#219,
CC#220,
CC#224, CC#225,
CC#232,
CC#252, CC#253,
CC#261, CC#265, CC#266,
CC#277, CC#278, CC#279,
CC#280, CC#282, CC#284,
CC#285, CC#292, CC#298,
CC#300, CC#301, CC#302, CP#008,
CP#009, CP#011,
CP#026, CP#027,
CP#030,
CP#031, CP#070,
CP#074, CP#093,
CP#094b, CP#098a,
CP#098b, CP#099b, CP#100b,
CP#102b,
CP#105b,
CP#106b, CP#109b,
CP#110b,
CP#111b, CP#119b,
CP#121b, CP#124a,
CP#124b, CP#125b,
CP#126b, CP#132b,
CP#133b, CP#134b, CP#138b,
CP#141b,
CP#146b, CP#148a.
CP#149a, CP#1501A,
CP#1502B, CP#151b,
CP#153b, CP#157b,
CP#158b, CP#160b,
CP#164b, CP#167b,
CP#169b, CP#170b,
CP#176, #518. DR4
problems
#1,
#7,
#9, #14, #15, #17,
#24, #30, #38,
#48, #49, #51, #52,
#54, #55, #58,
#59, #65, #67,
#73, #75, #79,
#81, #83, #96,
#97, #114, #117,
#122, #128, #129,
#130, #132, #133,
#137, #139, #142,
#148, #152,
#165, #167, #170,
#177, #183, #191,
#202, #205,
#214, #221, #230,
#236, #237, #240,
#250, #251, #253,
#258, #268, #271, #282,
#300, #323, #326,
#331, #341, #356,
#376, #377, #380,
#381, #383, #384, #389,
#406, #428,
#442, #454, #469,
#471, #472,
#486, #488, #494,
#506, PAC#32, CC#3, CC#18,
CC#29, CC#53, CC#66, CC#67,
CC#86,
CC#121,
CC#123,
CC#126,
CC#129,
CC#144, CC#150,
CC#153, CC#155,
CC#180,
CC#228,
CC#235, CC#236, CC#240,
CC#271,
CC#276,
CC#289, CC#290,
CC#299,
CP#007,
CP#014, CP#015,
CP#016, CP#020,
CP#025, CP#037,
CP#040, CP#051,
CP#059, CP#065,
CP#067, CP#069,
CP#072, CP#076,
CP#079, CP#080,
CP#095b, CP#096b,
CP#101a, CP#103a,
CP#106a, CP#108a,
CP#113a, CP#114a
CP#115b, CP#116b, CP#120b,
CP#122b, CP#132a,
CP#135a, CP#140b,
CP#142b, CP#143a,
CP#144b, CP#147a,
CP#148b, CP#1502A,
CP#154a, CP#159b,
CP#161b, CP#163a,
CP#163b, CP#166,
CP#171b, CP#173,
CP#174, CP#175. DR5
problems
#8, #10,
#16, #18, #26,
#29,
#33,
#39, #45, #47,
#50, #56, #61,
#69, #70, #71,
#74, #78,
#82, #88, #90,
#95, #98, #99,
#101,
#103, #106,
#112, #116, #118,
#126, #140,
#141, #147, #149,
#150, #156, #166,
#168, #171, #175,
#180, #188, #189,
#190, #193, #196,
#199, #200, #201,
#207, #208
#212, #215, #232, #241,
#244, #247,
#256,
#263, #267, #274,
#292, #298, #305,
#306, #317, #322,
#327, #329, #333,
#336, #337, #340,
#346, #347, #350,
#355, #363, #375,
#390, #393,
#397, #408, #415,
#421, #432, #440,
#444, #456,
#458, #467, #474,
#476,
#482,
#485,
#497, #502,
#514,
EB#27, EB#44,
Y#8,
CC#63,
CC#72,
CC#73,
CC#102,
CC#139, CC#147, CC#287,
CP#004,
CP#005, CP#013,
CP#017, CP#023,
CP#028, CP#036,
CP#045, CP#048,
CP#050, CP#054,
CP#061, CP#077,
CP#085, CP#091,
CP#092, CP#097a,
CP#099a,
CP#107a, CP#110a,
CP#118a, CP#119a,
CP#120a, CP#123a,
CP#125a, CP#126a,
CP#131a, CP#136b,
CP#146a, CP#147b,
CP#149b, CP#151a,
CP#164a, CP#167a,
CP#172,
CP#177a,
DR6
problems
#11, #20, #27,
#44, #46,
#53, #63, #64,
#80, #86, #89,
#93, #104, #111,
#115,
#125, #138, #143,
#151, #157, #158,
#160, #163, #176,
#182, #186, #209,
#210, #220, #224,
#228,
#235, #242, #248,
#249, #252, #259,
#260,
#262, #291, #319,
#324, #334,
#352,
#357, #360, #378,
#388, #392, #398,
#399, #411, #413,
#417, #420, #426,
#433, #448, #450,
#460, #464, #468,
#490, #499, #500,
#504,
#508,
#515,
#516, #517, EB#45,
Y#15,
CC#146,
CC#152,
CC#286,
CC#297,
CP#010,
CP#012, CP#032,
CP#034, CP#039, CP#041,
CP#042, CP#053,
CP#055,
CP#057, CP#063,
CP#066, CP#073,
CP#078, CP#086,
CP#087, CP#088,
CP#090, CP#095a,
CP#109a, CP#111a,
CP#116a,
CP#121a, CP#128a,
CP#128b, CP#129a,
CP#130b, CP#133a,
CP#134a, CP#137a,
CP#138a, CP#139a,
CP#141a, CP#144a,
CP#1501C, CP#1502C,
CP#155a, CP#155b,
CP#156a, CP#156b, CP#157a,
CP#158a, CP#161a,
CP#162a, CP#165b,
CP#165c, CP#171a. DR7
problems
#2, #4,
#19, #23,
#36, #41, #60,
#62, #85, #94,
#108, #120,
#136, #145, #169,
#184, #195, #226,
#231, #233, #238, #245,
#254, #261, #270,
#276, #283, #288,
#290, #299,
#307,
#315, #320, #361, #371,
#372, #394, #395,
#403, #405, #452,
#462, #473, #479,
#491, #493, #496,
#503, #505, #507,
#509, #513, CC#148,
CC#149, CC#151, CP#002,
CP#003, CP#022,
CP#033,
CP#043, CP#052,
CP#058, CP#064,
CP#075, CP#081,
CP#100a, CP#103b,
CP#104a, CP#112a,
CP#115a, CP#117a,
CP#122a, CP#127a,
CP#136a, CP#140a,
CP#142a, CP#145a,
CP#1501B, CP#152a,
CP#153a, CP#159a,
CP#160a, CP#165a,
CP#169a,
CP#170a.
DR8
problems
#5, #32,
#102, #127, #159,
#164, #173, #181,
#192, #194, #203,
#211, #213, #222,
#227, #239, #243,
#255, #264, #265,
#266, #280, #284, #285,
#286,
#293, #295, #301,
#303,
#310, #311, #316, #325,
#332, #335, #338,
#339, #344, #348,
#351, #353, #362,
#364, #366, #367,
#369,
#370, #374, #382,
#402, #414,
#423, #430, #436,
#438, #475, #481,
#484, #495, #498,
#510,
CP#001,
CP#006, CP#018,
CP#019, CP#021,
CP#024, CP#029, CP#044,
CP#046, CP#047, CP#049,
CP#056, CP#060, CP#068,
CP#082, CP#084,
CP#089, CP#102a,
CP#105a,
CP#125c,
CP#129b, CP#130a,
CP#130c, CP#168,
