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Problems Categorised by Difficulty Rating

From January 1974, nearly all problems published in my competition have had a Difficulty Rating from 1 (much too easy) to 8 (extremely difficult) assigned, for the purposes of my Double Dummy Master Points Scheme.  The DRs for problems that appeared before that have DRs proposed by ace solver Jean-Marc Bihl, who very kindly undertook the task after he had submitted solutions (nearly all correct) to problems #1 to #212.

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, #310, #311, #325, #332, #335, #338, #339, #344, #348, #351, #353, #362, #364, #366, #367, #370, #374, #382, #386, #402, #414, #423, #430, #436, #438, #475, #481, #484, #495, #498, #510, CP#006, CP#018, CP#019, CP#021, CP#024, CP#029, CP#044, CP#046, CP#049,  CP#056.

DR7 problems

#2, #4, #19, #23, #31, #36, #41, #60, #62, #85, #94, #108, #120, #136, #145, #169, #184, #195, #226, #231, #238, #245, #254, #261, #270, #276, #283, #288, #289, #290, #299, #307, #315, #320, #371, #372, #394, #395, #403, #405, #452, #462, #473, #479, #491, #493, #496, #503, #505, #507, #509, CP#022, CP#043, CP#052, CP#058.

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, #235, #248, #259, #260, #262, #291, #319, #324, #334, #352, #354, #357, #360, #378, #388, #392, #398, #399, #411, #413, #417, #420, #426, #433, #448, #450, #460, #464, #468, #490, #499, #500, #504, #508, CP#010, CP#012, CP#032, CP#034, CP#041, CP#042, CP#053, CP#057, CP#063.

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, #103, #106, #109, #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, #241, #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, #497, #502, CC#72, CC#73, CP#004, CP#005, CP#013, CP#017, CP#023, CP#036, CP#045, CP#048, CP#050, CP#054, CP#061.

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, #144, #148, #152, #165, #167, #170, #177, #183, #191, #202, #205, #214, #221, #230, #236, #237, #240, #250, #251, #253, #258, #268, #282, #300, #323, #326, #331, #341, #356, #376, #377, #380, #381, #383, #389, #406, #419, #428, #442, #454, #469, #471, #472, #486, #488, #494, #506, CC#3, CC#18, CC#29, CC#53, CC#66, CC#67, CC#86, CP#007, CP#014, CP#015, CP#016, CP#020, CP#025, CP#037, CP#040, CP#051 CP#059

DR3 problems

#3, #13, #21, #22, #25, #28, #34, #37, #42, #43, #57, #66, #76, #91, #92, #100, #101, #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, #328, #342, #343, #358, #368, #379, #391, #400, #401, #404, #424, #446, #447, #451, #459, #470, #477, #478, #483, #489, #501, #511, #512, E&W#3, CC#26, CC#31, CC#44, CC#54, CC#64, CC#70, CC#128, CC#158, CC#301, CP#008, CP#009, CP#011, CP#026, CP#027, CP#031.

DR2 problems

#6, #12, #35, #40, #68, #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, #407, #418, #422, #425, #429, #435, #437, #439, #441, #443, #449, #453, #455, #457, #461, #465, #480, #487, #492, 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#45, CC#49, CC#50, CC#51, CC#56, CC#57, CC#58, CC#59, CC#60, CC#61, CC#69, CC#71, CC#74, CC#75, 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#112, CC#113, CC#114, CC#115, CC#116, CC#118, CC#125, CC#130, CC#133, CC#138, CC#237, CC#238, CC#250, CP#038, CP#062.

DR1 problems

#77, #119, #155, #172, #187, #229, #387, #396, #409, #410, #412, #416, #434, #463, #466, 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#24, CC#27, 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#98, CC#99, CC#109, CC#110, CC#111, CC#164, CC#169, CC#183, CC#191, CC#196, CC#203, CC#206, CC#207, CC#208, CC#209, CC#210, CC#212, CC#243, CC#244, CC#245, CC#249, CC#254, CC#255, CC#256, CC#258, CC#260, CC#262, CC#294, CC#303, CC#304.